Electric drive axle system control method and related device

Abstract

The invention discloses an electric drive axle system control method and a related device, relates to the technical field of automobile parts, fully considers the relationship between the temperature change caused by heat generated by friction and the lubricating oil amount when core parts are in a working state, and after the stress value of each transmission core part is determined, the friction power corresponding to the stress value is determined firstly, and then the friction power corresponding to the stress value is determined; the method comprises the following steps of: firstly, determining a stress value of each transmission core component, then determining a lubricating oil amount corresponding to each stress value by utilizing a pre-constructed heat dissipation demand relationship representing a mapping relationship between friction power and the lubricating oil amount, and finally, controlling an oil pump controller to add lubricating oil to each transmission core component based on the lubricating oil amount, so that the heat dissipation demand is met by accurately controlling the lubricating oil amount. Therefore, the influence of temperature change on the electric drive axle system is reduced, and the problem of low reliability of the electric drive axle system with the aluminum alloy shell caused by non-uniform thermal elastic deformation of the shell due to a non-uniform thermal state is further avoided.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and in particular to a control method and related device for an electric drive axle system. Background Technology

[0002] With the rapid development of electric vehicles and energy-saving technologies, electric drive axle systems are constantly evolving towards higher efficiency, higher power density, and lighter weight. Under this trend, aluminum alloy housings, due to their significant weight reduction, are gradually replacing traditional cast iron housings and becoming the mainstream choice for the integrated housing of the electric drive axle's main reducer and differential.

[0003] In actual operation, the coefficient of thermal expansion of aluminum alloy is significantly higher than that of cast iron, making the housing extremely sensitive to changes in operating temperature, especially under high load, continuous high torque, or high speed conditions, which intensifies heat generation within the electric drive axle system. If the heat dissipation design is uneven or the cooling capacity is insufficient, the housing temperature can easily become excessively high, either locally or overall. This uneven thermal state can cause non-uniform thermoelastic deformation of the housing, compromising the geometric accuracy and relative position of critical bearing seats, increasing gear misalignment, and leading to decreased gear meshing accuracy. This decreased gear meshing accuracy directly causes abnormal concentration of contact forces, reduced transmission efficiency, increased vibration and noise, and premature tooth surface failure—a series of problems affecting the reliability of the aluminum alloy housing electric drive axle system.

[0004] In summary, improving the reliability of aluminum alloy housing electric drive axle systems has become an urgent problem to be solved. Summary of the Invention

[0005] In view of the above problems, this application provides a control method and related apparatus for an electric drive axle system to improve the reliability of an aluminum alloy housing electric drive axle system. The specific solution is as follows:

[0006] The first aspect of this application provides a control method for an electric drive axle system, comprising:

[0007] Acquire the key shaft system data set of the electric drive axle system;

[0008] The pre-built static analysis model of the electric drive axle system is called to process the key shaft data set to obtain the set of force values ​​of the core transmission components. The set of force values ​​of the core transmission components includes the force values ​​of each core transmission component.

[0009] Determine the set of frictional power corresponding to the set of force values ​​of each core transmission component. The set of frictional power includes the frictional power corresponding to the force values ​​of each core transmission component.

[0010] The pre-generated heat dissipation demand relationship is invoked to determine the set of lubricating oil quantity corresponding to the set of friction power. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity.

[0011] The oil pump controller delivers lubricating oil to each core transmission component based on the amount of lubricating oil in the lubricating oil quantity set.

[0012] In one possible implementation, the key shaft system data set of the electric drive axle system is obtained, including:

[0013] Acquire different types of system shaft data sets for electric drive axle systems with aluminum alloy housings;

[0014] The key shaft system data set is composed of different types of system shaft system data groups.

[0015] In one possible implementation, a pre-built static analysis model of the electric drive axle system is invoked to process the key shaft system data set, obtaining a set of force values ​​for the core transmission components, including:

[0016] Call the static analysis model of the electric drive axle system to process different types of system shaft data sets, and at least obtain the gear force value set corresponding to each gear and the bearing force value set corresponding to each bearing in the electric drive axle system.

[0017] The set of force values ​​for the core transmission component consists of at least the force value set for gears and the force value set for bearings.

[0018] In one possible implementation, the set of frictional power corresponding to the set of force values ​​of the core transmission component is determined, including:

[0019] The gear friction power set for each gear is determined based on the gear force value set, and the bearing friction power set for each bearing is determined based on the bearing force value set.

[0020] The friction power set consists of at least the gear friction power set and the bearing friction power set.

[0021] In one possible implementation, a pre-generated heat dissipation demand relationship is invoked to determine the set of lubricating oil quantities corresponding to the set of friction power, including:

[0022] The first lubricating oil mass flow rate group required for each gear is determined based on the gear friction power group, and the second lubricating oil mass flow rate group required for each bearing is determined based on the bearing friction power group.

[0023] The required first lubricating oil volumetric flow rate for each gear is determined based on the first lubricating oil mass flow rate group, and the required second lubricating oil volumetric flow rate for each bearing is determined based on the second lubricating oil mass flow rate group.

[0024] The lubricating oil volume set consists of at least a first lubricating oil volume flow rate group and a second lubricating oil volume flow rate group.

[0025] One possible implementation also includes:

[0026] Obtain the current key shaft system data set of the electric drive axle system;

[0027] The pre-built static analysis model of the electric drive axle system is invoked to process the current key shaft system data set and obtain the heat dissipation analysis results.

[0028] If the heat dissipation analysis results do not meet the preset design requirements of the core transmission components, the process of obtaining the key shaft data set of the electric drive axle system is iteratively executed until the heat dissipation analysis results meet the preset design requirements of the core transmission components.

[0029] A second aspect of this application provides an electric drive axle system control device, comprising:

[0030] The acquisition unit is used to acquire the key shaft system data set of the electric drive axle system;

[0031] The first calling unit is used to call the pre-built static analysis model of the electric drive axle system to process the key shaft data set and obtain the set of force values ​​of the core transmission components. The set of force values ​​of the core transmission components includes the force values ​​of each core transmission component.

[0032] The determining unit is used to determine the set of frictional power corresponding to the set of force values ​​of the transmission core components. The set of frictional power includes the frictional power corresponding to the force values ​​of each transmission core component.

[0033] The second calling unit is used to call the pre-generated heat dissipation demand relationship to determine the lubricating oil quantity set corresponding to the friction power set. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity.

[0034] The control unit is used to control the oil pump controller and deliver lubricating oil to each transmission core component according to the amount of lubricating oil in the lubricating oil quantity set.

[0035] A third aspect of this application provides an electric drive axle system control device, including at least one processor and a memory connected to the processor, wherein:

[0036] Memory is used to store computer programs;

[0037] The processor is used to execute a computer program to enable the electric drive axle system control device to implement the electric drive axle system control method of the first aspect or any implementation thereof.

[0038] The fourth aspect of this application provides a computer program product including computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the electric drive bridge system control method of the first aspect or any implementation thereof.

[0039] The fifth aspect of this application provides a computer storage medium carrying one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the electric drive bridge system control method described in the first aspect or any implementation thereof.

[0040] By employing the above technical solution, the electric drive axle system control method and related device provided in this application fully consider the relationship between the temperature change caused by frictional heat generation of core components and the amount of lubricating oil during operation. After determining the force value of each transmission core component, the frictional power corresponding to the force value is first determined. Then, using the pre-constructed heat dissipation demand relationship characterizing the mapping relationship between frictional power and lubricating oil amount, the amount of lubricating oil corresponding to each force value is determined. Finally, based on the amount of lubricating oil, the oil pump controller is controlled to add lubricating oil to each transmission core component. By precisely controlling the amount of lubricating oil, the heat dissipation demand is met, thereby reducing the impact of temperature changes on the electric drive axle system and further avoiding the problem of low reliability of the aluminum alloy housing electric drive axle system caused by non-uniform thermoelastic deformation of the housing due to uneven thermal state. Attached Figure Description

[0041] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0042] Figure 1 A schematic flowchart of the electric drive axle system control method provided in this application;

[0043] Figure 2 Example diagram of the composition structure of the static analysis model of the electric drive axle system provided in this application;

[0044] Figure 3 Example diagram of the lubrication circuit design for an electric drive axle system that meets heat dissipation requirements provided in this application;

[0045] Figure 4 A flowchart illustrating the control method for the electric drive axle system provided in this application;

[0046] Figure 5 This is a schematic diagram of the structure of an electric drive axle system control device provided in an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the structure of the electric drive axle system control device in the embodiments of this application. Detailed Implementation

[0048] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0049] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0050] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0051] The electric drive axle system is one of the core powertrain components of an electric vehicle. It is a highly integrated drive unit that combines the drive motor, reducer (gearbox), inverter (power control module), and differential into one unit. The electric drive axle system is directly installed on the vehicle axle and is used to drive the wheels.

[0052] The existing aluminum alloy housing electric drive axle system suffers from a decrease in gear meshing accuracy due to thermal deformation, which reduces the reliability, durability, and NVH (Noise, Vibration, and Harshness) performance of the electric drive axle during service.

[0053] Existing technologies typically improve the reliability of electric drive axle systems by either increasing the amount of lubricating oil to enhance heat dissipation or by increasing the thickness of the aluminum alloy housing to improve system rigidity. However, these existing solutions introduce numerous problems, including increased drag losses, reduced transmission efficiency, increased weight of the electric drive axle system, and increased costs.

[0054] To address the aforementioned problems, this application provides a control method and related apparatus for an electric drive axle system.

[0055] Optional, participate Figure 1 This application provides a schematic flowchart of a control method for an electric drive axle system.

[0056] like Figure 1As shown, the control method for the electric drive axle system includes the following steps:

[0057] Step 101: Obtain the key shaft data set of the electric drive axle system.

[0058] It should be noted that the electric drive axle system in this embodiment is an electric drive axle system with an aluminum alloy housing. The key shaft data set includes different types of system shaft data groups for the aluminum alloy housing electric drive axle system.

[0059] Specifically, different types of system shaft data sets include, but are not limited to, support and constraint data sets, transmission and meshing datasets, and foundation and strength data sets. For example, the support and constraint data set may specifically include bearing type data, the transmission and meshing data set may specifically include gear parameter data, and the foundation and strength data set may specifically include diameter parameter data for each gear shaft.

[0060] Optionally, different types of system shaft data sets of the electric drive axle system with aluminum alloy housing can be obtained, and key shaft data sets can be formed by different types of system shaft data sets.

[0061] Step 102: Call the pre-built static analysis model of the electric drive axle system to process the key shaft data set and obtain the set of force values ​​of the core transmission components. The set of force values ​​of the core transmission components includes the force values ​​of each core transmission component.

[0062] It should be noted that static analysis models are a fundamental tool in engineering mechanics, mainly used to study the force and deformation characteristics of an object in equilibrium under the action of a force system. In this embodiment, a static analysis model of the electric drive axle system with an aluminum alloy shell is pre-constructed, and this model is used to calculate the force values ​​of the core transmission components in the aluminum alloy shell electric drive axle system.

[0063] For example, see Figure 2 The following is an example diagram of the composition structure of the static analysis model of the electric drive axle system provided in this application.

[0064] like Figure 2 As shown, b1 to b9 represent all bearings in the aluminum alloy housing electric drive axle system, and g1 to g8 represent all gears in the same system. The static analysis model of the electric drive axle system includes the static analysis models of all shafts, bearings, and gears shown in the figure. Specifically, the static analysis model of the shafts uses Timoshenko beam elements, the static analysis model of the bearings uses nonlinear bearing elements, the static analysis model of the gear web uses rigid beam elements, and the static analysis model at the gear meshing point uses spring elements; the spring stiffness can be specifically equivalent to the meshing stiffness of each gear pair.

[0065] Optionally, the static analysis model of the electric drive axle system is called to process different types of system shaft data sets, so as to obtain at least the gear force value set corresponding to each gear and the bearing force value set corresponding to each bearing in the electric drive axle system, and at least the gear force value set and the bearing force value set constitute the force value set of the core transmission component.

[0066] Specifically, the static analysis model of the electric drive axle system generally proceeds in either the reverse or forward direction of the transmission path when handling different types of system shaft data sets. It can first calculate the force at the gear meshing point, then perform a force analysis on the shaft, calculate the bearing support reaction force, and finally synthesize the final forces on each core transmission component.

[0067] For example, calculate the forces acting at the gear meshing point: circumferential force, radial force, and axial force. Then, add all the forces acting on the shaft to the corresponding positions on the shaft, establish force or moment balance equations, and solve the equation system to obtain the support reactions at the two bearings. Finally, synthesize the final forces on the core transmission components. For gears, the force on the tooth surface is generally composed of the calculated forces acting at the gear meshing point; for bearings, the support reactions are the radial load borne by the bearing. For bearings capable of withstanding lateral loads, their axial load needs to be determined by axial force balance.

[0068] Step 103: Determine the set of frictional power corresponding to the set of force values ​​of the transmission core components. The set of frictional power includes the frictional power corresponding to the force values ​​of each transmission core component.

[0069] It should be noted that the core transmission components include, but are not limited to, gears and bearings.

[0070] Optionally, the gear friction power group of each gear is determined based on the gear force value group, and the bearing friction power group of each bearing is determined based on the bearing force value group, and the friction power set is composed of at least the gear friction power group and the bearing friction power group.

[0071] For example, let the gear friction power be... The formula for calculating gear friction power is:

[0072] ;

[0073] ;

[0074] in, F is the coefficient of friction of the gear teeth during gear meshing. N V is the normal force in the tooth surface contact, and Vs is the relative sliding velocity of the tooth surface. For fluid lubrication friction systems, The boundary lubrication friction coefficient is obtained through experiments; For a weighted system, For the thickness of the lubricating oil film The ratio of the overall surface roughness S to the surface roughness S.

[0075] Among them, the thickness of the lubricating oil film for cylindrical gears commonly used in aluminum alloy housing electric drive axle systems. The calculation formula can be:

[0076] ;

[0077] Where ρ1 and ρ2 represent the radii of curvature of the two tooth surfaces of any pair of gears; ρ represents the relative radii of curvature of the two tooth surfaces, with a negative sign for internal gear pairs and a positive sign for external gear pairs; v1 and v2 represent the Poisson's ratio of the gear material; E1 and E2 represent the elastic moduli of the two gears; α oil V represents the measured pressure viscosity coefficient of the lubricating oil; υ0 represents the measured viscosity of the lubricating oil; V e q represents the entrainment speed of the gear pair; q represents the contact force per unit length of the tooth surface.

[0078] Among them, fluid lubrication friction system The calculation process, obtained through regression analysis of multiple experimental data, can be summarized as follows:

[0079] ;

[0080] Where b1 to b9 represent the regression coefficients determined by the experiment, and can generally be taken as b1=-8.916, b2=1.033, b3=1.036, b4=-0.354, b5=2.812, b6=-0.101, b7=0.753, b8=-0.391, b9=0.62; SR is the relative sliding ratio of the tooth surface; Ph is the tooth surface contact stress.

[0081] Let the bearing friction power be The formula for calculating bearing friction power is:

[0082] ;

[0083] in, For bearing friction torque, Where f is the bearing speed, f1 and f2 are coefficients related to the bearing type, and d m Where is the bearing's mean diameter, and F is the equivalent bearing load. a This is for bearing thrust load.

[0084] Step 104: Call the pre-generated heat dissipation demand relationship to determine the lubricating oil quantity set corresponding to the friction power set. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity.

[0085] It should be noted that the heat sources in the aluminum alloy housing electric drive axle system mainly include gear meshing friction and bearing rolling friction. Therefore, it is necessary to calculate the friction power of each gear and each bearing. After calculating the friction power of these two core transmission components, the total heat generation power of the entire aluminum alloy housing electric drive axle system is obtained. The lubricating oil flow rate that meets this heat generation power can remove all the heat generated during the operation of the core transmission components, thereby satisfying the heat dissipation requirements of the aluminum alloy housing electric drive axle system.

[0086] Therefore, the heat dissipation demand relationship is a mapping relationship between friction power and lubricating oil quantity.

[0087] Optionally, a first lubricating oil mass flow rate group required for each gear is determined based on the gear friction power group, a second lubricating oil mass flow rate group required for each bearing is determined based on the bearing friction power group, a first lubricating oil volume flow rate group required for each gear is determined based on the first lubricating oil mass flow rate group, and a second lubricating oil volume flow rate group required for each bearing is determined based on the second lubricating oil mass flow rate group, wherein at least the first lubricating oil volume flow rate group and the second lubricating oil volume flow rate group constitute the lubricating oil quantity set.

[0088] Specifically, the formulas for calculating the mass flow rate of lubricating oil for gears and bearings that meet heat dissipation requirements are as follows:

[0089] ;

[0090] in, The specific heat capacity of lubricating oil, This refers to the temperature rise of the lubricating oil.

[0091] The corresponding volumetric flow rates of the lubricating oil for the mass flow rate of gears and bearings can be:

[0092] .

[0093] Step 105: Control the oil pump controller to deliver lubricating oil to the transmission core components based on the concentrated amount of lubricating oil.

[0094] Finally, the oil pump controller delivers lubricating oil of the corresponding volumetric flow rate to the core transmission components: bearings and gears.

[0095] The electric drive axle system control method provided in this application fully considers the relationship between temperature changes caused by frictional heat generation of core components and the amount of lubricating oil during operation. After determining the force value of each transmission core component, the frictional power corresponding to the force value is first determined. Then, using the pre-constructed heat dissipation demand relationship that characterizes the mapping relationship between frictional power and lubricating oil amount, the amount of lubricating oil corresponding to each force value is determined. Finally, based on the amount of lubricating oil, the oil pump controller is controlled to add lubricating oil to each transmission core component. By precisely controlling the amount of lubricating oil, the heat dissipation demand is met, thereby reducing the impact of temperature changes on the electric drive axle system. This further avoids the problem of low reliability of the aluminum alloy housing electric drive axle system caused by non-uniform thermoelastic deformation of the housing due to uneven thermal conditions.

[0096] Optionally, in the above-mentioned electric drive axle system control method, after controlling the oil pump controller to deliver lubricating oil to each transmission core component according to the lubricating oil quantity in the lubricating oil quantity set, the following steps are also included:

[0097] Obtain the current key shaft system data set of the electric drive axle system;

[0098] The pre-built static analysis model of the electric drive axle system is invoked to process the current key shaft system data set and obtain the heat dissipation analysis results.

[0099] If the heat dissipation analysis results do not meet the preset design requirements of the core transmission components, the process of obtaining the key shaft data set of the electric drive axle system is iteratively executed until the heat dissipation analysis results meet the preset design requirements of the core transmission components.

[0100] The above steps are subsequent processing steps after supplying lubricating oil to the aluminum alloy housing electric drive axle system, based on rated operating conditions to analyze the reliability of the aluminum alloy housing electric drive axle system. In this process, the heat dissipation analysis results mainly include system bearing life damage information and gear safety factor. After calculating these data used to evaluate the reliability of the coefficients, it is determined whether these data meet the system design requirements. Specifically, the system design requirements are related to the products in which the aluminum alloy housing electric drive axle system is applied. For example, if the aluminum alloy housing electric drive axle system is applied to heavy trucks, it is usually required that the service life of core transmission components such as gears and bearings reach 1.6 million kilometers, and the gear check safety factor be greater than 1.1.

[0101] If the reliability data of the system after adding lubricating oil does not meet the preset design requirements, the process iteratively executes the steps from obtaining the key shaft data set of the electric drive axle system in the previous specific embodiment to controlling the oil pump controller and delivering lubricating oil to each transmission core component based on the lubricating oil quantity concentration, until the heat dissipation analysis results of the aluminum alloy housing electric drive axle system meet the preset design requirements of the transmission core components.

[0102] For example, see Figure 3 This application provides an example diagram of the lubrication circuit design for an electric drive axle system that meets heat dissipation requirements.

[0103] like Figure 3 As shown, this demonstrates a lubrication circuit design scheme for an electric drive axle system that considers temperature variations and meets heat dissipation requirements. This scheme designs the lubrication pipe diameter and outlet orifice diameter according to the lubrication oil volume requirements of each gear and bearing in the electric drive axle system, achieving precise control over the system's lubrication and heat dissipation needs.

[0104] Optional, see Figure 4 The flowchart of the electric drive axle system control method provided in this application is shown in the example diagram.

[0105] First, the drive shaft system of the electric drive axle system is modeled. Then, the lubrication oil quantity of gears and bearings is analyzed based on the heat dissipation requirements. The reliability of the electric drive axle system is analyzed according to the rated operating conditions. When the reliability meets the preset requirements, the flow distribution of the active lubrication system is determined. When the reliability does not meet the preset requirements, the lubrication oil quantity of gears and bearings is re-analyzed based on the heat dissipation requirements, and the reliability of the electric drive axle system is analyzed according to the rated operating conditions until the reliability meets the preset requirements, and then the lubrication oil quantity is distributed.

[0106] The above describes a control method for an electric drive axle system provided by an embodiment of this application. The following describes the apparatus for executing the above-described control method for an electric drive axle system.

[0107] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of an electric drive axle system control device provided in an embodiment of this application. Figure 5 As shown, the electric drive axle system control device includes:

[0108] The system comprises an acquisition unit 10, a first calling unit 20, a determination unit 30, a second calling unit 40, and a control unit 50; wherein:

[0109] Acquisition unit 10 is used to acquire the key shaft system data set of the electric drive axle system;

[0110] The first calling unit 20 is used to call the pre-built static analysis model of the electric drive axle system to process the key shaft data set and obtain the set of force values ​​of the core transmission components. The set of force values ​​of the core transmission components includes the force values ​​of each core transmission component.

[0111] The determining unit 30 is used to determine the friction power set corresponding to the set of force values ​​of the transmission core components. The friction power set includes the friction power corresponding to the force values ​​of each transmission core component.

[0112] The second calling unit 40 is used to call the pre-generated heat dissipation demand relationship to determine the lubricating oil quantity set corresponding to the friction power set. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity.

[0113] The control unit 50 is used to control the oil pump controller to deliver lubricating oil to each transmission core component based on the lubricating oil volume concentration.

[0114] In one embodiment, the acquisition unit 10 is specifically used for:

[0115] Obtain data sets of different types of system shaft systems for electric drive axle systems with aluminum alloy housings;

[0116] The key axis data set is composed of the different types of axis data sets.

[0117] In one embodiment, the first calling unit 20 is specifically used for:

[0118] The static analysis model of the electric drive axle system is called to process different types of system shaft data sets, so as to obtain at least the gear force value set corresponding to each gear and the bearing force value set corresponding to each bearing in the electric drive axle system.

[0119] The set of force values ​​for the transmission core component consists of at least the set of force values ​​for the gears and the set of force values ​​for the bearings.

[0120] In one embodiment, the determining unit 30 is specifically used for:

[0121] The gear friction power set for each gear is determined based on the gear force value set, and the bearing friction power set for each bearing is determined based on the bearing force value set.

[0122] The friction power set consists of at least the gear friction power set and the bearing friction power set.

[0123] In one embodiment, the second calling unit 40 is specifically used for:

[0124] The first lubricating oil mass flow rate group required for each gear is determined based on the gear friction power group, and the second lubricating oil mass flow rate group required for each bearing is determined based on the bearing friction power group.

[0125] Based on the first lubricating oil mass flow rate group, the required first lubricating oil volume flow rate group for each gear is determined, and based on the second lubricating oil mass flow rate group, the required second lubricating oil volume flow rate group for each bearing is determined.

[0126] The lubricating oil volume set consists of at least the first lubricating oil volume flow rate group and the second lubricating oil volume flow rate group.

[0127] In one embodiment, the electric drive axle system control device further includes an iterative execution unit;

[0128] This iterative execution unit is specifically used for:

[0129] Obtain the current key shaft system data set of the electric drive axle system;

[0130] The pre-built static analysis model of the electric drive axle system is invoked to process the current key shaft system data set and obtain the heat dissipation analysis results.

[0131] If the heat dissipation analysis results do not meet the preset design requirements of the core transmission components, the step of obtaining the key shaft data set of the electric drive axle system is iteratively executed until the heat dissipation analysis results meet the preset design requirements of the core transmission components.

[0132] This application also provides an electric drive axle system control device in its embodiments. (See reference...) Figure 6 The diagram illustrates a structural schematic suitable for implementing the electric drive axle system control device in the embodiments of this application. The electric drive axle system control device in the embodiments of this application may include, but is not limited to, fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 6 The electric drive axle system control device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0133] like Figure 6 As shown, the electric drive axle system control device may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. When the electric drive axle system control device is powered on, the RAM 603 also stores various programs and data required for the operation of the electric drive axle system control device. The processing unit 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0134] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 607 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 608 including, for example, memory cards, hard drives, etc.; and communication devices 609. Communication device 609 allows the electric drive axle system control equipment to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6The diagram illustrates an electric drive axle system control device with various components; however, it should be understood that implementation or possession of all illustrated components is not required. Additional or fewer components may be implemented alternatively.

[0135] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the electric drive bridge system control methods provided in this application.

[0136] This application also provides a computer storage medium that carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the electric drive bridge system control methods provided in this application.

[0137] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0138] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0139] In the above embodiments, the implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, in the form of a computer program product.

[0140] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

Claims

1. A control method for an electric drive axle system, characterized in that, include: Acquire the key shaft system data set of the electric drive axle system; The key shaft data set is processed by calling a pre-built static analysis model of the electric drive axle system to obtain a set of force values ​​for the core transmission components, which includes the force values ​​of each core transmission component. Determine the set of frictional power corresponding to the set of force values ​​of the transmission core components, wherein the set of frictional power includes the frictional power corresponding to the force values ​​of each transmission core component; The pre-generated heat dissipation demand relationship is invoked to determine the lubricating oil quantity set corresponding to the friction power set. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity. The oil pump controller delivers lubricating oil to each transmission core component based on the amount of lubricating oil in the lubricating oil quantity set.

2. The control method for the electric drive axle system according to claim 1, characterized in that, The acquisition of the key shaft system data set of the electric drive axle system includes: Acquire different types of system shaft data sets for electric drive axle systems with aluminum alloy housings; The key shaft system data set is composed of the different types of system shaft system data groups.

3. The control method for the electric drive axle system according to claim 2, characterized in that, The process of calling a pre-built static analysis model of the electric drive axle system to process the key shaft system data set yields a set of force values ​​for the core transmission components, including: The static analysis model of the electric drive axle system is called to process different types of system shaft data sets, so as to obtain at least the gear force value set corresponding to each gear and the bearing force value set corresponding to each bearing in the electric drive axle system. The set of force values ​​for the transmission core component consists of at least the set of force values ​​for the gears and the set of force values ​​for the bearings.

4. The control method for the electric drive axle system according to claim 3, characterized in that, The determination of the friction power set corresponding to the set of force values ​​of the transmission core component includes: The gear friction power set for each gear is determined based on the gear force value set, and the bearing friction power set for each bearing is determined based on the bearing force value set. The friction power set consists of at least the gear friction power set and the bearing friction power set.

5. The control method for the electric drive axle system according to claim 4, characterized in that, The step of calling the pre-generated heat dissipation demand relationship to determine the lubricating oil quantity set corresponding to the friction power set includes: The first lubricating oil mass flow rate group required for each gear is determined based on the gear friction power group, and the second lubricating oil mass flow rate group required for each bearing is determined based on the bearing friction power group. Based on the first lubricating oil mass flow rate group, the required first lubricating oil volume flow rate group for each gear is determined, and based on the second lubricating oil mass flow rate group, the required second lubricating oil volume flow rate group for each bearing is determined. The lubricating oil quantity set consists of at least the first lubricating oil volume flow rate group and the second lubricating oil volume flow rate group.

6. The control method for an electric drive axle system according to claim 1, characterized in that, Also includes: Obtain the current key shaft system data set of the electric drive axle system; The pre-built static analysis model of the electric drive axle system is invoked to process the current key shaft system data set and obtain the heat dissipation analysis results. If the heat dissipation analysis results do not meet the preset design requirements of the core transmission components, the step of obtaining the key shaft data set of the electric drive axle system is iteratively executed until the heat dissipation analysis results meet the preset design requirements of the core transmission components.

7. A control device for an electric drive axle system, characterized in that, include: The acquisition unit is used to acquire the key shaft system data set of the electric drive axle system; The first calling unit is used to call the pre-built static analysis model of the electric drive axle system to process the key shaft data set and obtain the force value set of the transmission core components. The force value set of the transmission core components includes the force value of each transmission core component. A determining unit is used to determine the friction power set corresponding to the set of force values ​​of the transmission core components, wherein the friction power set includes the friction power corresponding to the force values ​​of each transmission core component. The second calling unit is used to call the pre-generated heat dissipation demand relationship to determine the lubricating oil quantity set corresponding to the friction power set. The heat dissipation demand relationship is used to characterize the mapping relationship between friction power and lubricating oil quantity. The control unit is used to control the oil pump controller to deliver lubricating oil to each transmission core component according to the amount of lubricating oil in the lubricating oil quantity set.

8. A control device for an electric drive axle system, characterized in that, It includes at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electric drive axle system control device can implement the electric drive axle system control method as described in any one of claims 1 to 6.

9. A computer program product, characterized in that, It includes computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the electric drive bridge system control method as described in any one of claims 1 to 6.

10. A computer storage medium, characterized in that, The storage medium carries one or more computer programs that, when executed by an electronic device, enable the electronic device to implement the electric drive bridge system control method as described in any one of claims 1 to 6.

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