Model selection method, system and equipment for rear pull rod of hybrid power box and storage medium

Abstract

The invention provides a model selection method, system and device for a rear pull rod of a hybrid power box and a storage medium. The method comprises the steps that the weight of the hybrid power box and the maximum torque TWOT and Fr output by the hybrid power box under the forward gear full-accelerator acceleration working condition are obtained; according to the weight of the hybrid power box and the maximum torque TWOT and Fr output by the hybrid power box, the stress condition of the rear pull rod bush is analyzed, and the stress value of the rear pull rod bush is obtained; the stress value of the rear pull rod bush is compared with a preset pull rod threshold value, and if the stress value of the rear pull rod bush is within the threshold value range, a rear pull rod mode is directly selected according to the stress value of the rear pull rod bush; and if the stress value of the rear pull rod is not in the pull rod threshold value range, the additional yawing moment and the vibration isolation amount of the rear pull rod lining are analyzed, and the mode of the rear pull rod is selected according to the additional yawing moment value and the vibration isolation amount value of the rear pull rod. According to the method, the pull rod type selection is based, the direction is clear for the type selection of the suspension of the pull rod of the hybrid power box, excessive or insufficient rear pull rod performance design caused by wrong selection is prevented, the cost is saved, and the period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile tie rods, and in particular to a selection method, system, equipment and storage medium for a hybrid box rear tie rod. Background Art

[0002] With the continuous reduction of oil resources and the increasingly stringent requirements for energy conservation and emission reduction, new energy vehicle technology has developed rapidly. Among them, hybrid models are the focus of current new energy vehicle development due to their excellent comprehensive performance in all aspects. The hybrid box of a hybrid model is mainly composed of an engine, a generator, a drive motor and a controller.

[0003] The suspension is an important force-transmitting component that fixes the powertrain to the car. Its main function is to support, isolate and attenuate the transmission of the powertrain's vibration and noise into the car, limit the displacement of the powertrain under extreme working conditions, thereby ensuring better NVH (Noise, Vibration, Harshness) performance in the car and improving the competitiveness of the entire vehicle.

[0004] The hybrid box suspension systems of current hybrid models all adopt a pendulum-type torque shaft arrangement. The hybrid assembly is installed on the vehicle body through the left suspension + right suspension + rear tie rod suspension scheme, and the vibration and noise generated during operation are attenuated by the suspension. Among them, there are two design schemes for the rear tie rod suspension: single tie rod and double tie rod. The single tie rod has a simple structure, low cost but low performance, while the double tie rod has a complex structure, high cost and high performance. In the prior art, the selection and design of the rear tie rod suspension mainly relies on the experience of engineers, and there is no unified design standard and specification, which easily leads to over- or under-design of the rear tie rod performance, and the tie rod scheme is often inconvenient to change in the later stage of vehicle development. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method, system, device and storage medium for selecting a rear tie rod of a hybrid box, so as to solve the problem that the rear tie rod is selected based on experience in the prior art, resulting in excessive or insufficient performance design of the rear tie rod.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a method for selecting a rear tie rod of a hybrid transmission, comprising the following steps:

[0007] Get the weight of the hybrid box and the maximum torque T output by the hybrid box under full throttle acceleration in the forward gear WOT,Fr ;

[0008] According to the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr , analyze the stress condition of the rear tie rod bushing and obtain the stress value of the rear tie rod bushing;

[0009] Compare the force value of the rear tie rod bushing with a preset tie rod threshold value, and if the force value of the rear tie rod bushing is within the threshold range, directly select the rear tie rod mode according to the force value of the rear tie rod bushing;

[0010] If the force value of the rear tie rod is not within the tie rod threshold range, the additional yaw moment and vibration isolation amount of the rear tie rod bushing are analyzed, and the mode of the rear tie rod is selected according to the additional yaw moment value and vibration isolation amount value of the rear tie rod.

[0011] Furthermore, the maximum torque T output by the hybrid box under the forward gear full throttle acceleration condition is obtained. WOT,Fr , specifically including:

[0012] Get the maximum output torque T of the engine MET 、Engine reduction ratio i EGR And the peak torque of the drive motor T MMT , reducer transmission ratio i RGR ;

[0013] According to the maximum output torque T of the engine MET 、Engine reduction ratio i EGR Get the engine torque T E ; Based on the peak torque T of the drive motor MMT , reducer transmission ratio i RGR Get the driving motor torque T M .

[0014] According to the engine torque T E and the drive motor torque T M The maximum torque T output by the hybrid box under full throttle acceleration in the forward gear is calculated. WOT,Fr .

[0015] Further, according to the maximum torque T output by the hybrid box WOT,Fr Before inputting into the hybrid box suspension model to analyze the stress of the rear tie rod bushing, it also includes:

[0016] The maximum torque T output by the hybrid box WOT,Fr Comparing with the preset torque value, if the maximum torque output by the hybrid box is greater than the first torque threshold, a double pull rod is selected for the rear pull rod of the hybrid box;

[0017] If the maximum torque output by the hybrid box is less than the second torque threshold, a single pull rod is used as the rear pull rod of the hybrid box;

[0018] If the maximum torque output by the hybrid case is between the first torque threshold and the second torque threshold, the stress condition of the rear tie rod bushing is analyzed.

[0019] Further, the force value of the rear tie rod bushing is compared with a preset tie rod threshold value. If the force value of the rear tie rod bushing is within the threshold range, the rear tie rod mode is directly selected according to the force value of the rear tie rod bushing, which specifically includes the following steps:

[0020] If the force on the rear tie rod bushing is greater than the first tie rod threshold, the hybrid box rear tie rod uses a double tie rod;

[0021] If the force on the rear tie rod bushing is less than the second tie rod threshold, a single tie rod is used for the hybrid box rear tie rod.

[0022] Furthermore, when the force on the rear tie rod bushing is between the first tie rod threshold and the second tie rod threshold, after analyzing the additional yaw moment and the vibration isolation amount, a single tie rod is selected only when both the additional yaw moment and the vibration isolation amount meet the preset values ​​at the same time, and a double tie rod is selected in other cases.

[0023] Furthermore, if a double tie rod is selected, the yaw moment of the main tie rod and the auxiliary tie rod can be balanced by adjusting the installation position of the auxiliary tie rod or re-matching the stiffness of the main and auxiliary rear tie rod bushings.

[0024] Further, according to the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr Analyze the stress of the rear tie rod bushing, including: the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr Input into the hybrid box suspension model to analyze the stress of the rear tie rod bushing;

[0025] When the weight of the hybrid case is input into the model, the weight of the hybrid case is set at the center of mass of the hybrid case.

[0026] On the other hand, the present application provides a hybrid case rear tie rod selection system, comprising:

[0027] A collection module is used to obtain the engine torque T E and the drive motor torque T M ;

[0028] The calculation module is used to calculate the maximum torque T output by the hybrid box under full throttle acceleration conditions in the forward gear. WOT,Fr ; and for the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr Analyze the stress condition of the rear tie rod bushing and obtain the stress value of the rear tie rod bushing;

[0029] The execution module compares the force value of the rear tie rod bushing with a preset tie rod threshold value, and if the force value of the rear tie rod is within the threshold range, directly selects the rear tie rod mode according to the force value of the rear tie rod bushing;

[0030] If the force value of the rear tie rod is not within the tie rod threshold range, the additional yaw moment and vibration isolation amount of the rear tie rod are analyzed, and the mode of the rear tie rod is selected according to the additional yaw moment value and vibration isolation amount value of the rear tie rod.

[0031] On the other hand, the present application provides a device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for selecting a rear tie rod of a hybrid case described above when executing the computer program.

[0032] On the other hand, the present application provides a computer-readable storage medium, which has a computer program, characterized in that when the computer program is executed by a processor, the steps of the method for selecting a rear tie rod of a hybrid case described above are implemented.

[0033] As described above, the present invention has the following beneficial effects: the present application obtains the maximum torque output by the hybrid box under the forward gear full throttle acceleration condition by analyzing the engine torque and the drive motor torque, and then analyzes the force value of the rear tie rod bushing according to the maximum torque output by the hybrid box, and selects the mode of the rear tie rod as a single tie rod or a double tie rod according to the force value of the tie rod bushing. In this way, there is a basis for selecting the rear tie rod according to different dynamics, and the direction of the design and selection of the hybrid box tie rod suspension is clarified, and the selection is no longer based on experience, which prevents the wrong selection from causing the rear tie rod performance design to be excessive or insufficient, and the need for rework, saving costs and shortening the cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shown is a flow chart of a method for selecting a rear tie rod for a hybrid case provided by the present invention;

[0035] Figure 2 It is an analytical model for the single-tie-rod hybrid case suspension system;

[0036] Figure 3 It is a top view of the single-tie rod hybrid box assembly layout;

[0037] Figure 4 For Figure 2 Analyzed rear tie rod bushing working point stiffness curve;

[0038] Figure 5 For Figure 2 Analyzed active side mounting jog stiffness of the rear tie rod bushing;

[0039] Figure 6 For Figure 2 The analyzed installation inching stiffness of the passive side of the rear tie rod bushing;

[0040] Figure 7 It is a spring series model of bracket-suspension-bracket;

[0041] Figure 8 It is a top view of the double-tie rod hybrid box assembly layout; DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] The present invention provides a method for selecting a rear tie rod of a hybrid transmission, comprising the following steps:

[0044] Get engine torque T E and the drive motor torque T M .

[0045] Among them, first obtain the maximum output torque T of the engine MET 、Engine reduction ratio I EGR And obtain the peak torque T of the drive motor MMT , reducer transmission ratio i RGR .

[0046] Then according to the maximum output torque T of the engine MET 、Engine reduction ratio I EGR Get the engine torque T E ; Based on the peak torque of the drive motor and the transmission ratio of the reducer RGR Get the driving motor torque T M .

[0047] Specifically, the engine torque T E Specifically, it refers to the torque output under full throttle acceleration conditions in the engine forward gear. The engine torque T is obtained according to the following formula: E :

[0048] T E =T MET ×i EGR ×f MF

[0049] Among them, T MET It is the maximum powertrain torque of the engine, in Nm.

[0050] i EGR is the engine gear ratio (Engine Gear Ratio);

[0051] f MFis the magnification factor, usually taken as 1.2.

[0052] Driving motor torque T M Specifically, it refers to the torque output by the drive motor when accelerating at full throttle in the forward gear. The drive motor torque T is obtained according to the following formula: M :

[0053] T M =T MMT ×i RGR

[0054] Among them, T MMT is the peak torque of the driving motor (Maximun Motor Torque), unit: Nm;

[0055] i RGR is the reducer gear ratio (Reducer Gear Ratio).

[0056] According to the engine torque T E and the drive motor torque T M The maximum torque T output by the hybrid box under full throttle acceleration in the forward gear is calculated. WOT,Fr .

[0057] Specifically, the maximum torque T output by the hybrid box during full throttle acceleration (WOT) is calculated. WOT,Fr , because only when the vehicle is moving forward and the throttle is at its maximum, the output torque of the hybrid box is the largest in all situations.

[0058] The maximum torque T output of the hybrid box under full throttle acceleration in forward gear WOT,Fr According to the following formula:

[0059] T WOT,Fr =T E +T M

[0060] Among them, T E is the engine torque, T M is the driving motor torque.

[0061] The maximum torque T output by the hybrid box WOT,Fr A first mapping relationship is established with a preset torque value of the rear tie rod, and a mode of the rear tie rod is selected according to the first mapping relationship.

[0062] Specifically, the maximum torque T output by the hybrid box WOT,Fr The calculated result is compared with the preset torque threshold of the rear tie rod. In this embodiment, the torque threshold is divided into two according to a large amount of data analysis. If the maximum torque T output by the hybrid box is WOT,FrIf the maximum torque output of the hybrid box is greater than the first torque threshold, the rear tie rod of the hybrid box uses a double tie rod. WOT,Fr If the maximum torque output of the hybrid box is T WOT,Fr If the torque is between the first torque threshold and the second torque threshold, the stress condition of the rear tie rod bushing is analyzed, a second mapping relationship is established according to the stress of the rear tie rod bushing and a preset rear tie rod bushing stress value, and the mode of the rear tie rod is selected according to the second mapping relationship.

[0063] When the maximum torque T WOT,Fr When the torque is greater than the first torque threshold, the required torque under the WOT condition is relatively large, and a single tie rod can no longer meet the requirement, so a double tie rod is directly selected.

[0064] When the maximum torque T WOT,Fr When the torque is less than the first torque threshold, the required torque under the WOT condition is relatively small and can be satisfied by a single tie rod, so a single tie rod is directly selected.

[0065] When the maximum torque output of the hybrid box is T WOT,Fr When the torque is between the first torque threshold and the second torque threshold, according to experience, either a single tie rod or a double tie rod can be selected. Generally, a single tie rod is selected first, and then verified. If it fails, a double tie rod is selected.

[0066] For example, when the peak power of the drive motor is 130KW, the corresponding peak torque of the drive motor is T MMT is 300Nm, and the speed ratio is 10.39, then the motor output torque T M =3117N·m; the corresponding maximum engine output torque / speed is 205Nm / 3500rpm, and the engine reduction ratio is 2.78, so the engine direct drive output torque T E =684N·m; According to the above formula, the maximum output torque of the hybrid box assembly is T WOT,Fr =3801Nm. The first torque threshold and the second torque threshold are obtained by analyzing a large amount of data. For example, according to the analysis of a large amount of data, the first torque threshold is 4000Nm, the second torque threshold is 2000Nm, and the current maximum output torque of the hybrid box assembly is T WOT,Fr =3801Nm, which is between the first torque threshold and the second torque threshold, and further analysis is needed to select the rear tie rod.

[0067] In order to save time, the present invention is to WOT,FrWhen it is between the first torque threshold and the second torque threshold, the stress condition of the rear tie rod bushing is further analyzed, and then a second mapping relationship is established according to the stress of the rear tie rod bushing and the preset rear tie rod bushing stress value of the rear tie rod, and the mode of the rear tie rod is selected according to the second mapping relationship.

[0068] When conducting a force analysis of the rear tie rod bushing, first establish a hybrid case suspension model, specifically a multi-body dynamics simulation model of the hybrid case suspension system. Since the single tie rod model is relatively simple and the simulation analysis is relatively fast, a single tie rod model is generally established first for analysis. If a single tie rod cannot meet the conditions, a double tie rod can be directly selected. If further verification is required, a double tie rod model is established for analysis. When establishing a hybrid case suspension model, first establish a single tie rod model, then add the weight of the hybrid case and the maximum torque T output by the hybrid case under full throttle acceleration conditions in the forward gear. WOT,Fr Input into the model, and the stress condition of the rear tie rod bushing can be directly obtained according to the simulation results. For example, after the above data is input into the model, Table 1 is obtained.

[0069] Table 1 Coordinate system of hybrid box mass center and suspension elastic center

[0070]

[0071] Specifically, when the weight of the hybrid box is input into the model, the weight of the hybrid box is set at the center of mass of the hybrid box, so that the simulation results are more accurate. Figure 2 As shown in FIG. 1 , it is a schematic diagram of the hybrid box suspension system analysis model. The stress conditions of each point are obtained according to the simulation results. The stress conditions of the rear tie rod bushing of the above data are shown in Table 2.

[0072] Table 2 The forces of each suspension under WOT condition

[0073]

[0074] The forces in three directions of the rear tie rod bushing can be obtained from Table 2. The force Fx in the X direction of the rear tie rod bushing is compared with the preset tie rod threshold. If the force on the rear tie rod bushing is greater than the first tie rod threshold, a double tie rod is selected for the hybrid box rear tie rod. If the force on the rear tie rod bushing is less than the second tie rod threshold, a single tie rod is selected for the hybrid box rear tie rod. If the force on the rear tie rod bushing is between the first tie rod threshold and the second tie rod threshold, the additional yaw moment and vibration isolation amount of the rear tie rod are further analyzed, and a third mapping relationship is established between the additional yaw moment and vibration isolation amount of the rear tie rod and the preset additional yaw moment and vibration isolation amount of the rear tie rod, and the mode of the rear tie rod is selected according to the third mapping relationship.

[0075] For example, the threshold of the first tie rod is 10000N, and the threshold of the second tie rod is 6000N. When Fx is greater than 10000N, the double tie rod is directly selected. When Fx is less than 6000N, the single tie rod is directly selected. However, if Fx is between 10000N and 6000N, it is necessary to further analyze the additional yaw moment and vibration isolation. The single tie rod can be selected only when the additional yaw moment and vibration isolation meet the preset values ​​at the same time. As long as one of the additional yaw moment and vibration isolation does not meet the preset value, the double tie rod mode is selected.

[0076] For example, in the above data, it can be seen from Table 2 that Fx is 9576N, which is between 10000N and 6000N, so it is necessary to further analyze the additional yaw moment and vibration isolation.

[0077] When analyzing the additional yaw moment, the rear tie rod big end bushing and small end bushing are observed from the top view. The ideal arrangement position is that the line connecting the rear tie rod big end bushing and the small end bushing coincides with the Y direction of the hybrid box mass center. However, due to the arrangement reasons, this is usually not satisfied, resulting in a certain distance between the line connecting the rear tie rod big end bushing and the Y direction of the hybrid box mass center. As a result, under the condition of rapid acceleration, the hybrid box assembly has an additional yaw moment around the Z direction, causing the angle of the driving half shafts on both sides to change, thereby exacerbating the generation of torque steering. Figure 3 As shown, it is a top view of the layout structure of a single-tie rod hybrid box assembly. The rear tie rod does not coincide with the center of mass in the Y direction. The offset distance of the rear tie rod can be obtained from the distance between the center of mass of the hybrid box assembly and the Y-axis coordinate of the rear tie rod, which is L. From Table 1, it can be obtained that the offset distance of the above-mentioned rear tie rod is L = -52.919-(-124.000) = 71.081 mm.

[0078] The offset distance L of the rear tie rod combined with the force of the rear tie rod at X in Table 2 can be used to obtain the additional yaw moment = Fx × L = 680.672 Nm, and the additional yaw moment can be compared with the preset additional yaw moment. If the additional yaw moment is less than the preset additional yaw moment, it is qualified, and if the additional yaw moment is greater than or equal to the preset additional yaw moment, it is unqualified, indicating that the single tie rod does not meet the requirements.

[0079] When analyzing the vibration isolation, we must first obtain the active side stiffness K of the suspension. PT , passive side stiffness of suspension K B and the rear tie rod bushing stiffness K M , the stiffness K of the vibration isolation system can be obtained through the suspension bushing vibration isolation theory.

[0080] like Figure 4The figure shows the working point stiffness curve of the rear tie rod bushing. The force-displacement curve of the rear tie rod bushing is obtained through analysis. Through force analysis, the working point static stiffness of the rear tie rod bushing under the WOT condition is 2800N / mm. Through the dynamic-static ratio relationship, the dynamic stiffness of the working point at this time is further obtained to be 2800×1.4=3920N / mm, where 1.4 is the dynamic-static ratio coefficient.

[0081] The side connected to the hybrid box is the active side of the suspension, and the side connected to the vehicle body is the active side of the suspension. Figure 5 The figure shows the installation stiffness of the active side of the rear tie rod bushing. Figure 6 The figure shows the installation stiffness of the passive side of the rear tie rod bushing. Figure 7 Shown is a spring series model of bracket-suspension-bracket.

[0082] The stiffness calculation formula of the vibration isolation system composed of the active side of the suspension, the stiffness of the rear tie rod bushing, and the passive side of the suspension is:

[0083]

[0084] Where K is the stiffness of the vibration isolation system; K PT is the active lateral stiffness of the suspension; K M is the suspension stiffness, and in this embodiment, is the rear tie rod bushing stiffness; K B is the passive lateral stiffness of the suspension.

[0085] The vibration isolation amount can be calculated by the following formula:

[0086]

[0087] Where: T dB is the vibration isolation amount. According to the above formula, K can be calculated. PT / K M and K B / K M They are the vibration isolation amounts for different values.

[0088] Combined with the above data, the vibration isolation amount is calculated to be 17.786dB, which does not meet the preset vibration isolation value. The preset vibration isolation value in this embodiment is 20dB. Therefore, the vibration isolation amount of the preset single-pull rod mode does not meet the requirements and should be changed to a double-pull rod mode.

[0089] When the single tie rod mode fails, the double tie rod mode is used. It is necessary to analyze and verify the stress of the rear tie rod bushing in the double tie rod mode. The double tie rod includes a main tie rod and an auxiliary tie rod. The position of the main tie rod is fixed, and the position of the auxiliary tie rod can be adjusted. The main tie rod and auxiliary tie rod data of the double tie rod are input into the hybrid box suspension model to obtain Table 1 and Table 2 of the double tie rod mode. Figure 8As shown in the figure, it is a top view of the layout of the double-tie rod hybrid box assembly. The main tie rod, auxiliary tie rod and center of mass are all at a certain distance. In order to keep the main tie rod and auxiliary tie rod balanced as much as possible, the additional yaw moment of the main tie rod must be equal to the additional yaw moment generated by the auxiliary tie rod, that is, Fx1×L1 and Fx2×L2. By adjusting the position of the auxiliary tie rod installation point, which is equivalent to changing L1 and L2, the additional yaw moment of the column tie rod and the auxiliary tie rod can be balanced, or the stiffness of the main and auxiliary rear tie rod bushings can be re-matched, which is equivalent to changing Fx1 and Fx2 to make the two equal.

[0090] On the other hand, the present invention also provides a hybrid case rear tie rod selection system, comprising:

[0091] A collection module is used to obtain the engine torque T E and the drive motor torque T M .

[0092] By collecting the maximum output torque T of the engine MET 、Engine reduction ratio i EGR And obtain the peak torque of the drive motor and the transmission ratio i of the reducer RGR That's it.

[0093] The calculation module is used to calculate the maximum torque T output by the hybrid box under full throttle acceleration conditions in the forward gear. WOT,Fr ; and for the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr The stress condition of the rear tie rod bushing is analyzed to obtain the stress value of the rear tie rod bushing.

[0094] The maximum output torque T of the engine MET 、Engine reduction ratio i EGR And obtain the peak torque T of the drive motor MMT , reducer transmission ratio i RGR Calculate the engine torque T E and the drive motor torque T M , then according to the engine torque T E and the drive motor torque T M Calculate the maximum torque T output by the hybrid box under full throttle acceleration in the forward gear WOT,Fr .

[0095] The execution module is used to convert the maximum torque T output by the hybrid box WOT,Fr A first mapping relationship is established with a preset torque value of the rear tie rod, and a mode of the rear tie rod is selected according to the first mapping relationship.

[0096] The execution module is provided with a first torque threshold, a second torque threshold, a first tie rod threshold, a second tie rod threshold, a preset value of the additional yaw moment and a preset value of the vibration isolation amount, and determines whether they meet the requirements through calculation.

[0097] On the other hand, the present invention also provides a device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for selecting a rear tie rod of a hybrid case described above when executing the computer program.

[0098] On the other hand, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium has a computer program, and when the computer program is executed by a processor, the steps of the method for selecting a rear tie rod of a hybrid case described above are implemented.

[0099] It should be noted that the computer-readable storage medium shown in the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0100] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0101] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves. The units or modules described may also be arranged in a processor, for example, may be described as: a processor includes a data acquisition module, a first processing module, a second processing module, and a result generation module. The names of these units or modules do not, in some cases, limit the units or modules themselves.

[0102] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A method for selecting a rear tie rod for a hybrid transmission, characterized in that: The following steps are involved: Get the weight of the hybrid box and the maximum torque T output by the hybrid box under full throttle acceleration in the forward gear WOT,Fr ; According to the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr , analyze the stress condition of the rear tie rod bushing and obtain the stress value of the rear tie rod bushing; Compare the force value of the rear tie rod bushing with a preset tie rod threshold value, and if the force value of the rear tie rod bushing is within the threshold range, directly select the rear tie rod mode according to the force value of the rear tie rod bushing; If the force value of the rear tie rod is not within the tie rod threshold range, the additional yaw moment and vibration isolation amount of the rear tie rod bushing are analyzed, and the mode of the rear tie rod is selected according to the additional yaw moment value and vibration isolation amount value of the rear tie rod.

2. The method for selecting a hybrid case rear tie rod according to claim 1, characterized in that: The maximum torque T output by the hybrid box under full throttle acceleration in the forward gear is obtained. WOT,Fr , specifically including: Get the maximum output torque T of the engine MET 、Engine reduction ratio i EGR And the peak torque of the drive motor T MMT , reducer transmission ratio i RGR ; According to the maximum output torque T of the engine MET 、Engine reduction ratio i EGR Get the engine torque T E ; Based on the peak torque T of the drive motor MMT , reducer transmission ratio i RGR Get the driving motor torque T M . According to the engine torque T E and the drive motor torque T M The maximum torque T output by the hybrid box under full throttle acceleration in the forward gear is calculated. WOT,Fr .

3. The method for selecting a rear tie rod for a hybrid transmission according to claim 1, characterized in that: According to the maximum torque T output by the hybrid box WOT,Fr Before inputting into the hybrid box suspension model to analyze the stress of the rear tie rod bushing, it also includes: The maximum torque T output by the hybrid box WOT,Fr Comparing with the preset torque value, if the maximum torque output by the hybrid box is greater than the first torque threshold, a double pull rod is selected for the rear pull rod of the hybrid box; If the maximum torque output by the hybrid box is less than the second torque threshold, a single pull rod is used as the rear pull rod of the hybrid box; If the maximum torque output by the hybrid case is between the first torque threshold and the second torque threshold, the stress condition of the rear tie rod bushing is analyzed.

4. The method for selecting a hybrid case rear tie rod according to claim 1, characterized in that: The force value of the rear tie rod bushing is compared with a preset tie rod threshold. If the force value of the rear tie rod bushing is within the threshold range, the rear tie rod mode is directly selected according to the force value of the rear tie rod bushing, which specifically includes the following steps: If the force on the rear tie rod bushing is greater than the first tie rod threshold, the hybrid box rear tie rod uses a double tie rod; If the force on the rear tie rod bushing is less than the second tie rod threshold, a single tie rod is used for the hybrid box rear tie rod.

5. The method for selecting a hybrid case rear tie rod according to claim 4, characterized in that: When the force on the rear tie rod bushing is between the first tie rod threshold and the second tie rod threshold, after analyzing the additional yaw moment and the vibration isolation amount, a single tie rod is selected only when both the additional yaw moment and the vibration isolation amount meet the preset values ​​at the same time, and a double tie rod is selected in other cases.

6. The method for selecting a hybrid case rear tie rod according to claim 4, characterized in that: If double tie rods are selected, the yaw moment of the main tie rod and the auxiliary tie rod can be balanced by adjusting the installation position of the auxiliary tie rod or re-matching the stiffness of the main and auxiliary rear tie rod bushings.

7. The method for selecting a hybrid case rear tie rod according to claim 1, characterized in that: According to the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr Analyze the stress of the rear tie rod bushing, including: the weight of the hybrid box and the maximum torque T output by the hybrid box WOT,Fr Input into the hybrid box suspension model to analyze the stress of the rear tie rod bushing; When the weight of the hybrid case is input into the model, the weight of the hybrid case is set at the center of mass of the hybrid case.

8. A hybrid box rear tie rod selection system, characterized in that: include, A collection module is used to obtain the engine torque T E and the drive motor torque T M ; The calculation module is used to calculate the maximum torque T output by the hybrid box under full throttle acceleration conditions in the forward gear. WOT,Fr ; and the maximum torque T output by the hybrid box according to the weight of the hybrid box and the WOT,Fr Analyze the stress condition of the rear tie rod bushing and obtain the stress value of the rear tie rod bushing; An execution module, used for comparing the force value of the rear tie rod bushing with a preset tie rod threshold value, and directly selecting the rear tie rod mode according to the force value of the rear tie rod bushing if the force value of the rear tie rod is within the threshold range; If the force value of the rear tie rod is not within the tie rod threshold range, the additional yaw moment and vibration isolation amount of the rear tie rod are analyzed, and the mode of the rear tie rod is selected according to the additional yaw moment value and vibration isolation amount value of the rear tie rod.

9. A device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for selecting a rear tie rod of a hybrid case as claimed in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, the computer-readable storage medium having a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for selecting a hybrid case rear tie rod according to any one of claims 1 to 7 are implemented.

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