Hybrid transmission start-stop knocking prediction method and system

Abstract

The invention discloses a hybrid transmission start-stop knock prediction method and system, and the method comprises the steps: constructing a gear pair knock kinetic model and a gear pair knock kinetic equation, and constructing a power assembly knock kinetic model containing the gear pair knock kinetic model based on dynamics simulation analysis software; obtaining kinetic parameters and a torque curve, inputting the kinetic parameters and the torque curve into the power assembly knocking kinetic model, and obtaining a gear stress curve; and according to the gear stress curve, kinetic parameters are optimized, and the gear knocking degree is reduced. According to the method, the simplified power assembly knocking kinetic model is constructed, the knocking position and strength during starting and stopping can be rapidly predicted in the early stage of design, optimization guidance is carried out on multiple dimensions such as flywheel structure design, engine ignition time, motor torque and rotating speed, the knocking problem is rapidly optimized, and development time and cost are shortened.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, specifically to a method and system for predicting start-stop knocking in a hybrid transmission. Background Technology

[0002] For automotive transmissions, the presence of backlash in the gear pairs can cause changes in the gear meshing state when there are sudden changes in input torque or speed. In severe cases, this can lead to noticeable knocking noises from the transmission gears, affecting the customer's driving experience. Therefore, knocking is a major concern for both OEMs and transmission manufacturers.

[0003] Currently, in order to solve the gear knocking problem during the start-stop phase, manufacturers usually test the knocking performance of the transmission assembly on a bench after production, and then readjust the structural parameters such as gear stiffness based on the knocking performance, make a prototype, and conduct further testing.

[0004] However, the above-mentioned adjustment cycle is too long and the efficiency is slow. The produced transmission assembly contains redundant parts or over-considers secondary factors such as meshing damping, resulting in low calculation efficiency. Furthermore, it only adjusts structural parameters such as gear stiffness without combining them with motor torque control strategies, leading to unstable optimization results. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a method and system for predicting start-stop knocking in hybrid transmissions, aiming to solve the problems of slow efficiency, excessive consideration of secondary factors such as meshing damping leading to low computational efficiency, and unstable optimization results due to only adjusting structural parameters such as gear stiffness without combining motor torque control strategies.

[0006] To achieve the above objectives, this invention proposes a method for predicting start-stop knocking in a hybrid transmission, the method comprising: A gear pair impact dynamics model and gear pair impact dynamics equations are constructed, and a powertrain impact dynamics model incorporating the gear pair impact dynamics model is constructed based on dynamics simulation analysis software. Obtain dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves; Based on the gear force curve, the dynamic parameters are optimized to reduce the degree of gear knocking.

[0007] According to one aspect of the above technical solution, the step of constructing the gear pair impact dynamics model includes: Based on the start-stop scenario and power flow of the clutchless hybrid transmission, the internal model of the hybrid transmission is simplified, and a knocking dynamics model is constructed in the simulation software. The knocking dynamics model includes at least a P1 motor, a P1 motor gear pair, an idler gear, and a gear pair, which includes a first gear and a second gear. The gear meshing stiffness is converted into a constant.

[0008] According to one aspect of the above technical solution, the step of constructing the gear pair impact dynamics equation includes: establishing the gear pair impact dynamics equation based on the gear pair type, wherein the gear pair includes a load-bearing gear pair and a free-sleeving gear pair, and the dynamics equation of the load-bearing gear pair is:

[0009] The dynamic equation of the empty gear pair is:

[0010] in, θP1 , θP2 , θw1 , θw2 These are the moments of inertia. JP1 , JP2 , Jw1 , Jw2 angular displacement, Fbw1 and Fbw2 These are the meshing forces of the load-bearing gear and the unloaded gear, respectively. Rbp1 , Rbp2 , Rbw1 and Rbw2 These are the base circle radii of the driving gear, the load-bearing gear, and the empty sleeve gear, respectively. MP1 , MP2 Driven gear torque Mw Bearing gear load torque, Md The drag torque is for the driven gear.

[0011] Based on one aspect of the above technical solution, after constructing the dynamic equations for the empty gear pair and the load-bearing gear pair, the gear meshing force formula is: in, kmj For gear meshing stiffness, simplify to a constant. xj This represents the relative displacement of the gears. cmj For meshing damping, the damping effect is ignored and set to 0. When the gears are not meshing, i.e. The effect of hydrodynamic lubrication force, which does not consider the squeezing effect of lubricating oil film, is set to 0; By combining dynamic simulation analysis software, a powertrain impact dynamics model is constructed.

[0012] According to one aspect of the above technical solution, the steps of obtaining dynamic parameters and torque curves, inputting the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtaining the gear force curve include: Acquire dynamic parameters, which include at least the input engine inertia, dual-mass flywheel inertia, torsional stiffness curve, stiffness, damping and inertia of P1 motor, stiffness and inertia of gears and shafts, speed ratio of gear pair and drag torque of unloaded gear, and simultaneously acquire engine torque curve and P1 motor torque curve during engine start-up and shutdown. The dynamic parameters, engine torque curve, and P1 motor torque curve are input into the powertrain impact dynamics model, and the idler gear force curve, first gear force curve, second gear force curve, and dual-mass flywheel rotation angle curve are obtained.

[0013] According to one aspect of the above technical solution, the step of optimizing the dynamic parameters and reducing the degree of gear knocking based on the gear force curve includes: Analyze the force curves of the idler gear, the first gear, the second gear, and the rotation angle curve of the dual-mass flywheel, and determine the conditions for gear knocking. Based on the aforementioned striking conditions, the dynamic parameters of each component, the torque of the P1 motor, and the engine ignition timing are adjusted to reduce the stress on the gears and optimize the striking process.

[0014] This invention also proposes a hybrid transmission start-stop knock prediction system, which is used to implement the above-mentioned hybrid transmission start-stop knock prediction method. The system includes: The model building module is used to construct the gear pair impact dynamics model and gear pair impact dynamics equations, and based on dynamics simulation analysis software, to construct a powertrain impact dynamics model that includes the gear pair impact dynamics model; The curve calculation module is used to obtain dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves; The impact optimization module is used to optimize the dynamic parameters based on the gear force curve and reduce the degree of gear impact.

[0015] The present invention also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the hybrid transmission start-stop knock prediction method described above.

[0016] The present invention also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the hybrid transmission start-stop knock prediction method as described above.

[0017] In summary, the hybrid transmission start-stop knocking prediction method proposed in this invention ignores the influence of hydrodynamic lubrication forces caused by meshing damping during gear engagement and the lubricating oil film squeezing effect when gears are not meshing. Based on the power flow direction during engine start-stop, a simplified gear pair knocking dynamics model and gear pair knocking dynamics equations are constructed. By inputting dynamic parameters, engine torque curves, and P1 motor torque curves as boundary conditions into the powertrain knocking dynamics model, the force curves of the gears are obtained. By analyzing the force curves and adjusting the dynamic parameters of each component, the P1 motor torque, and the engine ignition timing, the degree of gear stress is reduced, and knocking is optimized. This invention, by constructing a simplified powertrain knocking dynamics model, can quickly predict the location and intensity of knocking during start-stop in the early design stages, and provides optimization guidance for multiple dimensions such as flywheel structure design, engine ignition timing, motor torque, and speed, rapidly optimizing knocking problems and shortening development time and costs.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a flowchart of the hybrid transmission start-stop knocking prediction method in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the powertrain impact dynamics model in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the load-bearing gear pair in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the hollow gear pair in Embodiment 1 of the present invention; Figure 5 The torque curves of the engine and the P1 motor before optimization in Embodiment 1 of the present invention are shown. Figure 6 These are the force curves of each tooth surface before optimization in Embodiment 1 of the present invention; Figure 7 The optimized engine torque curve and P1 motor torque curve are shown in Embodiment 1 of the present invention. Figure 8 These are the optimized force curves for each tooth surface in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the hybrid transmission start-stop knock prediction system in Embodiment 2 of the present invention; Figure 10 This is a structural block diagram of the electronic device in Embodiment 4 of the present invention. Detailed Implementation

[0020] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0023] Example 1 The figure shows a flowchart of a hybrid transmission start-stop knock prediction method according to Embodiment 1 of the present invention. The hybrid transmission start-stop knock prediction method includes the following steps S01-S03, wherein: S01. Construct a gear pair impact dynamics model and gear pair impact dynamics equations, and based on dynamics simulation analysis software, construct a powertrain impact dynamics model that includes the gear pair impact dynamics model.

[0024] For clutchless hybrid transmissions, the power flow during engine start-up and shutdown is from the engine to the P1 motor and then from the engine to the gears; there is no power output at the drive end. Therefore, as... Figure 2As shown, the internal model of the hybrid transmission can be simplified to a dynamic model consisting only of the P1 motor, the P1 motor gear pair, and the gear pair. Furthermore, for the gear pair knocking model, the gear meshing stiffness is simplified to a constant, and the effects of hydrodynamic lubrication forces, such as meshing damping during gear meshing and the fluid oil film squeezing effect when the gears are not meshing, are not considered. The knocking dynamic model includes at least the P1 motor, the P1 motor gear pair, an idler gear, and the gear pair. The gear pair is connected to the engine via a dual-mass flywheel, and the gear pair includes a first gear and a second gear.

[0025] After constructing the impact dynamics model, the impact dynamics equations of the gear pair are established based on the gear pair type, such as... Figure 3 and Figure 4 As shown, gear pairs include load-bearing gear pairs and unloaded gear pairs. The impact dynamics equation for a load-bearing gear pair is:

[0026] The dynamic equation of the empty sleeve gear pair is:

[0027] in, θP1 , θP2 , θw1 , θw2 These are the moments of inertia. JP1 , JP2 , Jw1 , Jw2 angular displacement, Fbw1 and Fbw2 These are the meshing forces of the load-bearing gear and the unloaded gear, respectively. Rbp1 , Rbp2 , Rbw1 and Rbw2 These are the base circle radii of the driving gear, the load-bearing gear, and the empty sleeve gear, respectively. MP1 , MP2 Driven gear torque Mw Bearing gear load torque, Md The drag torque is for the driven gear.

[0028] After constructing the dynamic equations for the empty gear pair and the load-bearing gear pair, the gear meshing force is calculated: in, kmj For gear meshing stiffness, simplify to a constant. xj This represents the relative displacement of the gears. cmj For meshing damping, the damping effect is ignored and set to 0. When the gears are not meshing, i.e. The effect of hydrodynamic lubrication force, which does not consider the squeezing effect of the lubricating oil film, is set to 0.

[0029] Based on the aforementioned gear pair impact dynamics model and gear pair impact dynamics equations, and combined with dynamics simulation analysis software, a powertrain impact dynamics model is constructed.

[0030] S02. Obtain the dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves.

[0031] The acquired dynamic parameters include, at a minimum, those shown in Table 1, such as the input engine inertia, dual-mass flywheel inertia, torsional stiffness curve, stiffness, damping, and inertia of the P1 motor, stiffness and inertia of the gears and shafts, gear ratio, and drag torque of the unloaded gear. Simultaneously, parameters such as... Figure 5 The engine torque curve and the P1 motor torque curve are shown during the engine start-up and shutdown process.

[0032] Table 1

[0033] The aforementioned dynamic parameters, engine torque curve, and P1 motor torque curve are input into the constructed powertrain impact dynamics model, and the following results are obtained: Figure 6 The force curves of the idler gear, the first gear, the second gear, and the rotation angle curve of the dual-mass flywheel are shown.

[0034] S03. Optimize dynamic parameters based on gear force curve to reduce gear knocking.

[0035] Based on historical knocking data, when a gear is subjected to force on one side, it does not knock; when a gear is subjected to force on both sides, knocking occurs, and the greater the force, the more severe the knocking.

[0036] like Figure 6 As shown, combining the force curves of the idler gear, first gear, second gear, and the rotation angle curve of the dual-mass flywheel, it can be analyzed that, based on the force conditions, the force on the idler gear is greater than that on the first and second gears, and no knocking occurs between the first and second gears. Figure 5 As shown, before motor P1 passes 0 Nm, the left tooth surface of the idler wheel is under force, while the right tooth surface is not. When motor P1 passes 0 Nm, the force on the left and right sides of the idler wheel changes, and the force amplitude decreases, resulting in a slight knocking. In the 1.5s-2s interval, when the dual-mass flywheel passes the 0-degree angle position, the left and right tooth surfaces of the idler wheel are under force simultaneously, and the force is greater, so the knocking is more severe.

[0037] Based on this, in order to optimize the knocking situation, this embodiment takes optimizing the P1 motor torque and engine ignition timing as an example, such as... Figure 7As shown, the engine is ignited at -10 Nm, and the force on each tooth surface is calculated. The results are as follows. Figure 8 As shown, based on the force analysis, it can be concluded that only when the P1 motor passes through 0 Nm does a slight knock occur, while the dual-mass flywheel does not pass through the 0-degree angle position and the idler wheel does not knock.

[0038] Alternatively, by adjusting the dynamic parameters of each component and the torque of the P1 motor, the stress on each tooth surface can be analyzed to determine whether the current optimization method has achieved the expected optimization effect. This embodiment will not list them all.

[0039] In summary, the hybrid transmission start-stop knocking prediction method proposed in this invention ignores the influence of hydrodynamic lubrication forces caused by meshing damping during gear engagement and the lubricating oil film squeezing effect when gears are not meshing. Based on the power flow direction during engine start-stop, a simplified gear pair knocking dynamics model and gear pair knocking dynamics equations are constructed. By inputting dynamic parameters, engine torque curves, and P1 motor torque curves as boundary conditions into the powertrain knocking dynamics model, the force curves of the gears are obtained. By analyzing the force curves and adjusting the dynamic parameters of each component, the P1 motor torque, and the engine ignition timing, the degree of gear stress is reduced, and knocking is optimized. This invention, by constructing a simplified powertrain knocking dynamics model, can quickly predict the location and intensity of knocking during start-stop in the early design stages, and provides optimization guidance for multiple dimensions such as flywheel structure design, engine ignition timing, motor torque, and speed, rapidly optimizing knocking problems and shortening development time and costs.

[0040] Example 2 In another aspect, this invention also provides a hybrid transmission start-stop knock prediction system; please refer to [link / reference needed]. Figure 9 The diagram shown is a schematic representation of the hybrid transmission start-stop knock prediction system in Embodiment 2 of the present invention. The hybrid transmission start-stop knock prediction system includes: The model building module 11 is used to construct the gear pair knocking dynamics model and gear pair knocking dynamics equations, and based on the dynamics simulation analysis software, to construct the powertrain knocking dynamics model that includes the gear pair knocking dynamics model; The curve calculation module 12 is used to obtain dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves; The knocking optimization module 13 is used to optimize dynamic parameters based on the gear force curve and reduce the degree of gear knocking.

[0041] For clutchless hybrid transmissions, the power flow during engine start-up and shutdown is from the engine to the P1 motor and then from the engine to the gears; there is no power output at the drive end. Therefore, as... Figure 2As shown, the internal model of the hybrid transmission can be simplified to a dynamic model consisting only of the P1 motor, the P1 motor gear pair, and the gear pair. Furthermore, for the gear pair knocking model, the gear meshing stiffness is simplified to a constant, and the effects of hydrodynamic lubrication forces, such as meshing damping during gear meshing and the fluid oil film squeezing effect when the gears are not meshing, are not considered. The knocking dynamic model includes at least the P1 motor, the P1 motor gear pair, an idler gear, and the gear pair. The gear pair is connected to the engine via a dual-mass flywheel, and the gear pair includes a first gear and a second gear.

[0042] After constructing the impact dynamics model, the impact dynamics equations of the gear pair are established based on the gear pair type, such as... Figure 3 and Figure 4 As shown, gear pairs include load-bearing gear pairs and unloaded gear pairs. The dynamic equation of a load-bearing gear pair is: The dynamic equation of the empty sleeve gear pair is:

[0043] in, θP1 , θP2 , θw1 , θw2 These are the moments of inertia. JP1 , JP2 , Jw1 , Jw2 angular displacement, Fbw1 and Fbw2 These are the meshing forces of the load-bearing gear and the unloaded gear, respectively. Rbp1 , Rbp2 , Rbw1 and Rbw2 These are the base circle radii of the driving gear, the load-bearing gear, and the empty sleeve gear, respectively. MP1 , MP2 Driven gear torque Mw Bearing gear load torque, Md The drag torque is for the driven gear.

[0044] After constructing the dynamic equations for the empty gear pair and the load-bearing gear pair, the gear meshing force is calculated: in, kmj For gear meshing stiffness, simplify to a constant. xj This represents the relative displacement of the gears. cmj For meshing damping, the damping effect is ignored and set to 0. When the gears are not meshing, i.e. The effect of hydrodynamic lubrication force, which does not consider the squeezing effect of the lubricating oil film, is set to 0.

[0045] Based on the aforementioned gear pair impact dynamics model and gear pair impact dynamics equations, and combined with dynamics simulation analysis software, a powertrain impact dynamics model is constructed.

[0046] The acquired dynamic parameters include, at a minimum, those shown in Table 1, such as the input engine inertia, dual-mass flywheel inertia, torsional stiffness curve, stiffness, damping, and inertia of the P1 motor, stiffness and inertia of the gears and shafts, gear ratio, and drag torque of the unloaded gear. Simultaneously, parameters such as... Figure 5 The engine torque curve and the P1 motor torque curve are shown during the engine start-up and shutdown process.

[0047] Table 1

[0048] The aforementioned dynamic parameters, engine torque curve, and P1 motor torque curve are input into the constructed powertrain impact dynamics model, and the following results are obtained: Figure 6 The force curves of the idler gear, the first gear, the second gear, and the rotation angle curve of the dual-mass flywheel are shown.

[0049] Based on historical knocking data, when a gear is subjected to force on one side, it does not knock; when a gear is subjected to force on both sides, knocking occurs, and the greater the force, the more severe the knocking.

[0050] like Figure 6 As shown, combining the force curves of the idler gear, first gear, second gear, and the rotation angle curve of the dual-mass flywheel, it can be analyzed that, based on the force conditions, the force on the idler gear is greater than that on the first and second gears, and no knocking occurs between the first and second gears. Figure 5 As shown, before motor P1 passes 0 Nm, the left tooth surface of the idler wheel is under force, while the right tooth surface is not. When motor P1 passes 0 Nm, the force on the left and right sides of the idler wheel changes, and the force amplitude decreases, resulting in a slight knocking. In the 1.5s-2s interval, when the dual-mass flywheel passes the 0-degree angle position, the left and right tooth surfaces of the idler wheel are under force simultaneously, and the force is greater, so the knocking is more severe.

[0051] Based on this, in order to optimize the knocking situation, this embodiment takes optimizing the P1 motor torque and engine ignition timing as an example, such as... Figure 7 As shown, the engine is ignited at -10 Nm, and the force on each tooth surface is calculated. The results are as follows. Figure 8 As shown, based on the force analysis, it can be concluded that only when the P1 motor passes through 0 Nm does a slight knock occur, while the dual-mass flywheel does not pass through the 0-degree angle position and the idler wheel does not knock.

[0052] Alternatively, by adjusting the dynamic parameters of each component and the torque of the P1 motor, the stress on each tooth surface can be analyzed to determine whether the current optimization method has achieved the expected optimization effect. This embodiment will not list them all.

[0053] In summary, the hybrid transmission start-stop knocking prediction method proposed in this invention ignores the influence of hydrodynamic lubrication forces caused by meshing damping during gear engagement and the lubricating oil film squeezing effect when gears are not meshing. Based on the power flow direction during engine start-stop, a simplified gear pair knocking dynamics model and gear pair knocking dynamics equations are constructed. By inputting dynamic parameters, engine torque curves, and P1 motor torque curves as boundary conditions into the powertrain knocking dynamics model, the force curves of the gears are obtained. By analyzing the force curves and adjusting the dynamic parameters of each component, the P1 motor torque, and the engine ignition timing, the degree of gear stress is reduced, and knocking is optimized. This invention, by constructing a simplified powertrain knocking dynamics model, can quickly predict the location and intensity of knocking during start-stop in the early design stages, and provides optimization guidance for multiple dimensions such as flywheel structure design, engine ignition timing, motor torque, and speed, rapidly optimizing knocking problems and shortening development time and costs.

[0054] Example 3 In another aspect, the present invention also proposes a computer-readable storage medium having stored thereon one or more computer programs that, when executed by a processor, implement the above-described hybrid transmission start-stop knock prediction method.

[0055] Those skilled in the art will understand that the logic or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable storage medium" can mean any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0056] More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable storage media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0057] Example 4 Figure 3 This is a structural block diagram of an electronic device provided in Embodiment 4. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the hybrid transmission start-stop knock prediction method in the above embodiments. Figure 3 The electronic device 30 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0058] like Figure 3 As shown, the electronic device 30 can be manifested as a general-purpose computing device, such as a server device. The components of the electronic device 30 may include, but are not limited to: at least one processor 31, at least one memory 32, and a bus 33 connecting different system components (including memory 32 and processor 31).

[0059] Bus 33 includes a data bus, an address bus, and a control bus.

[0060] The memory 32 may include volatile memory, such as RAM 321 (random access memory), and / or cache memory 322, and may further include ROM 323 (read-only memory).

[0061] The memory 32 may also include a program tool 325 having a set (at least one) of program modules 324, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0062] The processor 31 executes various functional applications and data processing by running computer programs stored in the memory 32, such as the hybrid transmission start-stop knock prediction method of the present invention.

[0063] Electronic device 30 can also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). This communication can be performed via I / O interface 35 (input / output interface). Furthermore, electronic device 30 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public network, such as the Internet) via network adapter 36. Figure 3 As shown, network adapter 36 communicates with other modules of the model-generated electronic device 30 via bus 33. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model-generated electronic device 30, including but not limited to: microcode, device drivers, redundant processors, disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0064] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0065] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A method for predicting start-stop knocking in a hybrid transmission, characterized in that, The hybrid transmission start-stop knock prediction method includes: A gear pair impact dynamics model and gear pair impact dynamics equations are constructed, and a powertrain impact dynamics model incorporating the gear pair impact dynamics model is constructed based on dynamics simulation analysis software. Obtain dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves; Based on the gear force curve, the dynamic parameters are optimized to reduce the degree of gear knocking.

2. The hybrid transmission start-stop knocking prediction method according to claim 1, characterized in that, The steps for constructing the impact dynamics model of the gear pair include: Based on the start-stop scenario and power flow of the clutchless hybrid transmission, the internal model of the hybrid transmission is simplified, and a knocking dynamics model is constructed in the simulation software. The knocking dynamics model includes at least a P1 motor, a P1 motor gear pair, an idler gear, and a gear pair, which includes a first gear and a second gear. The gear meshing stiffness is converted into a constant.

3. The hybrid transmission start-stop knocking prediction method according to claim 2, characterized in that, The step of constructing the gear pair impact dynamics equation includes: establishing the gear pair impact dynamics equation based on the gear pair type, wherein the gear pair includes a load-bearing gear pair and a free-sleeving gear pair, and the dynamics equation of the load-bearing gear pair is: The dynamic equation of the empty gear pair is: in, θP1 , θP2 , θw1 , θw2 These are the moments of inertia. JP1 , JP2 , Jw1 , Jw2 angular displacement, Fbw1 and Fbw2 These are the meshing forces of the load-bearing gear and the unloaded gear, respectively. Rbp1 , Rbp2 , Rbw1 and Rbw2 These are the base circle radii of the driving gear, the load-bearing gear, and the empty sleeve gear, respectively. MP1 , MP2 Driven gear torque Mw Bearing gear load torque, Md The drag torque is for the driven gear.

4. The hybrid transmission start-stop knocking prediction method according to claim 3, characterized in that, After constructing the dynamic equations for the empty gear pair and the load-bearing gear pair, the formula for the gear meshing force is: in, kmj For gear meshing stiffness, simplify to a constant. xj This represents the relative displacement of the gears. cmj For meshing damping, the damping effect is ignored and set to 0. When the gears are not meshing, i.e. The effect of hydrodynamic lubrication force, which does not consider the squeezing effect of lubricating oil film, is set to 0; By combining dynamic simulation analysis software, a powertrain impact dynamics model is constructed.

5. The hybrid transmission start-stop knocking prediction method according to claim 1, characterized in that, The steps of obtaining dynamic parameters and torque curves, inputting the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtaining the gear force curves include: Acquire dynamic parameters, which include at least the input engine inertia, dual-mass flywheel inertia, torsional stiffness curve, stiffness, damping and inertia of P1 motor, stiffness and inertia of gears and shafts, speed ratio of gear pair and drag torque of unloaded gear, and simultaneously acquire engine torque curve and P1 motor torque curve during engine start-up and shutdown. The dynamic parameters, engine torque curve, and P1 motor torque curve are input into the powertrain impact dynamics model, and the idler gear force curve, first gear force curve, second gear force curve, and dual-mass flywheel rotation angle curve are obtained.

6. The hybrid transmission start-stop knocking prediction method according to claim 1, characterized in that, The step of optimizing the dynamic parameters and reducing gear knocking based on the gear force curve includes: Analyze the force curves of the idler gear, the first gear, the second gear, and the rotation angle curve of the dual-mass flywheel, and determine the conditions for gear knocking. Based on the aforementioned striking conditions, the dynamic parameters of each component, the torque of the P1 motor, and the engine ignition timing are adjusted to reduce the stress on the gears and optimize the striking process.

7. A start-stop knocking prediction system for a hybrid transmission, characterized in that, The hybrid transmission start-stop knock prediction system is used to implement the hybrid transmission start-stop knock prediction method according to any one of claims 1-6, the system comprising: The model building module is used to construct the gear pair impact dynamics model and gear pair impact dynamics equations, and based on dynamics simulation analysis software, to construct a powertrain impact dynamics model that includes the gear pair impact dynamics model; The curve calculation module is used to obtain dynamic parameters and torque curves, input the dynamic parameters and torque curves into the powertrain impact dynamics model, and obtain the gear force curves; The impact optimization module is used to optimize the dynamic parameters based on the gear force curve and reduce the degree of gear impact.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the hybrid transmission start-stop knock prediction method as described in any one of claims 1-6.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes a computer program, it implements the hybrid transmission start-stop knock prediction method as described in any one of claims 1-6.

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