A DCT transmission modeling method, a rotational inertia equivalent method and a device

Abstract

The present invention discloses a DCT transmission modeling method, a rotational inertia equivalent method and a device, relating to the technical field of vehicle dynamic performance simulation. The rotational inertia equivalent method for the DCT transmission includes the following steps: obtaining the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission; dividing the rotational inertia of the DCT transmission into multiple parts of rotational inertia according to each shaft and the components on the shaft, with the clutch or synchronizer element as the demarcation point; obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculating the rotational inertia of each divided part according to the rotational inertia equivalent relationship of the gear pair. The present invention can not only obtain a more accurate rotational inertia of the DCT transmission, but also reduce the calculation amount of the rotational inertia.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle dynamic performance simulation, and particularly relates to a DCT gearbox modeling method, a rotational inertia equivalent method and a device. Background Art

[0002] Currently, most vehicle models in the industry are used to calculate the economy and ultimate dynamic performance under specific working conditions. The working conditions are relatively fixed, and a static simulation model supplemented by certain correction means can achieve the simulation accuracy required by engineering. That is, the rotational inertia of each gear provided in the gearbox variable specification parameter table can meet the simulation accuracy requirements.

[0003] In the field of system real-time simulation, there are mainly two existing simulation schemes for transmissions. One is the development of a full-physical system, and the other is pure digital simulation. The development cost of the full-physical system is high, it is particularly inflexible, and the R & D cycle is long; while pure digital simulation is flexible in means, but the difference from the real system may be large.

[0004] The steady-state modeling method is simple and effective. Its disadvantage is that it is difficult to accurately reflect the shifting process of the dynamic gearbox. Considering that the clutch engagement and shifting process of the gearbox also require a certain amount of time, and the vehicle state will also change during the clutch engagement and shifting process, rather than the vehicle speed remaining unchanged as assumed in automotive theory. Therefore, the steady-state model needs to be dynamically corrected, and this part of the calculation can only rely on empirical correction.

[0005] During the driving process of a vehicle including a gearbox, the rotational inertia is different when the gearbox is in different gears. The gearbox specification parameter table usually includes the rotational inertia preset for a certain gear. During the vehicle operation process, there are dynamic processes such as starting acceleration, uniform acceleration and then acceleration, and shifting. During the dynamic process, the rotational speeds of each component change to a certain extent, and thus there is angular acceleration. Each component has a rotational inertia of varying sizes. Therefore, the dynamic process simulation needs to consider the rotational inertia of the rotating components inside the gearbox.

[0006] The rotational inertia only depends on the shape of the rigid body, the mass distribution and the position of the rotation axis, and has nothing to do with the rotational state of the rigid body around the axis (such as the magnitude of the angular velocity). For a regular-shaped homogeneous rigid body, its rotational inertia can be directly calculated using a formula. For the rotational inertia of an irregular rigid body or a non-homogeneous rigid body, it is generally measured by experimental methods.

[0007] In the research on the shifting process control simulation model, based on the gearbox transmission route diagram, the rotational inertia of a single part is input into the existing modules of rotating components such as clutches, gears, shafts, and synchronizers provided by the simulation platform.

[0008] The transmission contains multiple rotating components such as input shafts, output shafts, gears, synchronizers, wet clutches, etc. Although most of them are relatively regular, the quantity is large. Due to the need to calculate a large number of rotating components, the calculation amount is large, and detailed component drawings are required for calculation. Usually, only the transmission manufacturers have such conditions, and there is a large dependence on the transmission manufacturers. Summary of the Invention

[0009] In view of the defects existing in the prior art, the first aspect of the present invention provides a method for equivalent moment of inertia of a DCT transmission, which can reduce the calculation amount of the moment of inertia while obtaining a more accurate moment of inertia of the DCT transmission.

[0010] To achieve the above object, the technical solution adopted by the present invention is:

[0011] A method for equivalent moment of inertia of a DCT transmission, the method comprising the following steps:

[0012] Obtain the transmission routes of each gear and the gear meshing relationships of each gear in the DCT transmission;

[0013] According to each shaft and the components on the shaft, and taking the clutch or synchronizer element as the demarcation point, divide the moment of inertia of the DCT transmission into the moments of inertia of multiple parts;

[0014] Obtain the speed ratios corresponding to the transmission routes of each gear in the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculate the moments of inertia of the divided parts according to the equivalent relationship of the moment of inertia of the gear pair.

[0015] In some embodiments, the step of dividing the moment of inertia of the DCT transmission into the moments of inertia of multiple parts according to each shaft and the components on the shaft, and taking the clutch or synchronizer element as the demarcation point, includes:

[0016] Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission;

[0017] Regard the outer input shaft, the components fixedly connected to the outer input shaft, and the gears externally meshing with the gear fixedly connected to the outer input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission;

[0018] Regard the first output shaft, the components fixedly connected to the first output shaft, and the gears externally meshing with the gear fixedly connected to the first output shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission;

[0019] Regarding the second output shaft, the components fixedly connected to the second output shaft, and the gears that are externally meshed with the gears fixedly connected to the second output shaft as a whole, and taking the moment of inertia of this whole as the equivalent factor of the DCT transmission's moment of inertia.

[0020] In some embodiments, obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculating the moments of inertia of each divided part according to the equivalent relationship of the moments of inertia of gear pairs, includes:

[0021] Obtaining the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear;

[0022] Representing the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear using the moments of inertia of each part as the equivalent factor;

[0023] Calculating the magnitudes of the moments of inertia of each part as the equivalent factor according to the magnitudes of the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear.

[0024] In some embodiments, according to the inertia equivalent to the input shaft = output shaft inertia * (speed ratio between the output shaft and the input shaft) 2 , representing the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear using the moments of inertia of each part as the equivalent factor. The second aspect of the present invention provides a DCT transmission moment of inertia equivalent device, which can not only obtain a more accurate DCT transmission moment of inertia but also reduce the calculation amount of the moment of inertia.

[0025] To achieve the above objectives, the technical solution adopted by the present invention is:

[0026] A DCT transmission moment of inertia equivalent device, including:

[0027] An acquisition module, which is used to obtain the transmission routes of each gear of the DCT transmission and the gear meshing relationships of each gear, the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear;

[0028] A division module, which is used to divide the DCT transmission moment of inertia into moments of inertia of multiple parts according to the shaft and the components on the shaft, with the clutch or synchronizer element as the demarcation point;

[0029] A calculation module, which calculates the moments of inertia of each divided part according to the speed ratios of each gear of the DCT transmission and the main reduction ratio, the moments of inertia equivalent to the input shaft when the DCT transmission is in each gear, and the equivalent relationship of the moments of inertia of gear pairs.

[0030] The third aspect of the present invention provides a modeling method for a DCT transmission model applicable to vehicle power performance simulation, which can reflect the gear shifting process of the transmission.

[0031] To achieve the above object, the technical solution adopted by the present invention is:

[0032] A DCT transmission modeling method, the method includes a shafting module modeling step, and the shafting module modeling step includes:

[0033] Obtain the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission;

[0034] According to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divide the rotational inertia of the DCT transmission into multiple parts of rotational inertia;

[0035] Obtain the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculate the rotational inertia of each divided part according to the equivalent relationship of the rotational inertia of the gear pair;

[0036] Build the shafting module according to the power transmission path, the equivalent position of the equivalent rotational inertia, the selection of speed ratio and gear position;

[0037] Mount the rotational inertia of each part at the equivalent position of the equivalent rotational inertia.

[0038] In some embodiments, the step of dividing the rotational inertia of the DCT transmission into multiple parts of rotational inertia according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, includes:

[0039] Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0040] Regard the outer input shaft, the components fixedly connected to the outer input shaft, and the gears externally meshing with the gear fixedly connected to the outer input shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0041] Regard the first output shaft, the components fixedly connected to the first output shaft, and the gears externally meshing with the gear fixedly connected to the first output shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0042] Regard the second output shaft, the components fixedly connected to the second output shaft, and the gears externally meshing with the gear fixedly connected to the second output shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission.

[0043] In some embodiments, obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, as well as the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculating the moments of inertia of each divided part according to the equivalent relationship of the moments of inertia of gear pairs, includes:

[0044] Obtaining the speed ratios of each gear of the DCT transmission and the main reduction ratio, as well as the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear;

[0045] Representing the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear by using the moments of inertia of each part as equivalent factors;

[0046] Calculating the magnitudes of the moments of inertia of each part as equivalent factors according to the magnitudes of the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear.

[0047] In some embodiments, it further includes:

[0048] Building a DCT efficiency module according to the shaft system efficiency MAP.

[0049] In some embodiments, it further includes the steps of modeling the dual clutch module, and the steps of modeling the dual clutch module include:

[0050] Determining the dynamic friction coefficient of the clutch according to the obtained clutch pressure P and the rotational speed difference between the driving and driven disks;

[0051] Obtaining the inner diameter R of the friction surface of the clutch 内 , the outer diameter R of the friction surface 外 and the number N of friction surfaces;

[0052] Taking the smaller value of the dynamic friction coefficient and the static friction coefficient as μ, and building the dual clutch module according to the clutch torque transmission formula Building the dual clutch module.

[0053] Compared with the prior art, the advantages of the present invention are:

[0054] The method for equivalent inertia of a DCT transmission in the present invention obtains the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission; according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divides the inertia of the DCT transmission into multiple parts of inertia; obtains the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculates the inertia of each divided part according to the equivalent relationship of the inertia of the gear pair. That is, it realizes the inertia of the DCT transmission applicable to dynamic performance simulation based on the conventional transmission specification table and the transmission route schematic diagram, can effectively reduce the problem of difficult to obtain a more accurate equivalent inertia during the process of building a dynamic simulation model using a certain mature DCT transmission, reduces the calculation amount, and reduces the dependence on DCT manufacturers. Brief Description of the Drawings

[0055] Figure 1 is a flowchart of the method for equivalent inertia of a DCT transmission in an embodiment of the present invention;

[0056] Figure 2 is a schematic diagram of the transmission route of a DCT transmission in an embodiment of the present invention;

[0057] Figure 3 is a schematic diagram of the shafting module of a DCT transmission in an embodiment of the present invention. Detailed Embodiment

[0058] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below by way of the accompanying drawings and by listing some alternative embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0059] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. Unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0060] Furthermore, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0061] It should be noted that an automatic transmission includes multiple rotating components such as multiple input shafts, output shafts, gears, synchronizers, wet clutches, etc. Although most of them are relatively regular, the quantity is large. Taking a 6DCT as an example, each of the two input shafts includes at least 1 shaft and 2 gears, a total of 3x2 = 6 rotating components. Each of the two output shafts includes at least 1 shaft, 4 gears, 2 synchronizer fixed seats, 2 sliding sleeves, 4 engaging teeth, 4 synchronizer cone rings (8 synchronizer cone rings if double-cone synchronizers are used), plus at least 35x2 = 70 rotating components such as 6 sliders, 6 positioning pins, 6 springs, etc. that need to be calculated. The calculation amount is large, and detailed component drawings are required for the calculation. Usually, only the transmission manufacturers have such conditions, and there is a large dependence on the transmission manufacturers.

[0062] To solve the problems existing in the prior art, refer to Figure 1 As shown, an embodiment of the present invention discloses a method for equivalent moment of inertia of a DCT transmission, and the method includes the following steps:

[0063] S1. Obtain the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission.

[0064] It can be understood that the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission can be determined according to the transmission specification parameter table and the transmission route schematic diagram.

[0065] S2. Divide the moment of inertia of the DCT transmission into multiple parts of the moment of inertia according to each shaft and the components on the shaft, with the clutch or synchronizer element as the demarcation point.

[0066] S3. Obtain the speed ratios corresponding to the transmission routes of each gear of the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculate the moment of inertia of each divided part according to the equivalent relationship of the moment of inertia of the gear pair.

[0067] The purpose of the embodiment of the present invention is to equivalently transform a DCT transmission to simplify the calculation of the moment of inertia. For this purpose, each shaft and the components constantly connected to the shaft (including fixed connection and external tooth meshing connection) can be regarded as a whole. Taking each clutch or synchronizer as the demarcation point, equivalent inertia equivalence is carried out, and the DCT transmission can be divided into multiple parts of equivalent moment of inertia. Combining with the equivalent moment of inertia of each gear provided in a parameter table of the transmission, equations are listed to solve, and multiple parts of equivalent moment of inertia obtained by division are obtained.

[0068] The following is illustrated with a specific example:

[0069] Participate Figure 2 As shown in the figure, the transmission routes of each gear and the gear meshing relationships of each gear of a 6-speed DCT transmission are given. It can be understood that the embodiment of the present invention does not limit the structure of the DCT transmission. For other types of DCT transmissions, the same method can also be used for processing.

[0070] For Figure 2 the DCT transmission in, IS inner, IS outer, OS1, and OS2 are used to represent the inner input shaft, the outer input shaft, the first output shaft, and the second output shaft respectively.

[0071] Among them, the inner input shaft (IS inner) is an even shaft, corresponding to the gear pairs of gears 2, 4, and 6, and the outer input shaft (IS outer) is an odd shaft, corresponding to the gear pairs of gears 3 and 5.

[0072] Specifically Figure 2 in, when each shaft and the components constantly connected to the shaft (including fixed connection and external tooth meshing connection) are regarded as a whole, and equivalent inertia equivalence is carried out with each clutch or synchronizer as the demarcation point, this DCT transmission in this embodiment is divided into four parts of equivalent moment of inertia. Combining with the equivalent moment of inertia of each gear provided in the parameter table of the transmission, equations are listed to solve and these four parts of moment of inertia are obtained. The specific process is as follows:

[0073] S21. The inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft are regarded as a whole, and the moment of inertia of this whole is used as the equivalent factor of the moment of inertia of the DCT transmission.

[0074] That is to say, the inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft and sleeved on other shafts through the tooth number ratio to the rotating components on the inner input shaft are regarded as a whole, and the moment of inertia of this part is denoted as J ISinner .

[0075] S22. Consider the external input shaft, the components fixedly connected to the external input shaft, and the gears that are externally meshed with the gear fixedly connected to the external input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the DCT transmission's moment of inertia.

[0076] That is to say, consider the external input shaft, the components fixedly connected to the external input shaft, and the gears that are externally meshed with the gear fixedly connected to the external input shaft and sleeved on other shafts through the tooth ratio equivalent to the rotating components on the external input shaft as a whole, and the moment of inertia of this part is denoted as J. ISouter 。

[0077] S23. Consider the first output shaft, the components fixedly connected to the first output shaft, and the gears that are externally meshed with the gear fixedly connected to the first output shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the DCT transmission's moment of inertia.

[0078] That is to say, consider the first output shaft, the components fixedly connected to the first output shaft, and the gears that are externally meshed with the gear fixedly connected to the first output shaft and sleeved on other shafts through the tooth ratio equivalent to the rotating components on the first output shaft as a whole, and the moment of inertia of this part is denoted as J. OS1 。

[0079] S24. Consider the second output shaft, the components fixedly connected to the second output shaft, and the gears that are externally meshed with the gear fixedly connected to the second output shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the DCT transmission's moment of inertia.

[0080] That is to say, consider the second output shaft, the components fixedly connected to the second output shaft, and the gears that are externally meshed with the gear fixedly connected to the second output shaft and sleeved on other shafts through the tooth ratio equivalent to the rotating components on the second output shaft as a whole, and the moment of inertia of this part is denoted as J. OS2 。

[0081] After completing the equivalent division of the DCT transmission's moment of inertia, the moment of inertia of each part corresponding to the speed ratio on each gear transmission route of the DCT transmission and the equivalent relationship of the gear pair's moment of inertia can be calculated. The specific process is as follows:

[0082] S31. Obtain the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moment of inertia equivalent to the input shaft when the DCT transmission is in each gear.

[0083] For Figure 2 the DCT transmission in, the speed ratios of its sixth gear are respectively denoted as: i 1 、i 2 、i 3 、i 4 、i 5 、i 6; The two main reduction ratios are denoted as i fd1 and i fd2 ; It can be understood that the above-mentioned main reduction ratios are all known parameters in the DCT transmission.

[0084] S32. The moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear is expressed by the moment of inertia of each part used as the equivalent factor.

[0085] In this embodiment, according to the moment of inertia equivalent to the input shaft = moment of inertia of the output shaft * (speed ratio of the output shaft to the input shaft) 2 , the moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear is expressed by the moment of inertia of each part used as the equivalent factor.

[0086] S33. Calculate the moment of inertia of each part used as the equivalent factor according to the moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear.

[0087] For Figure 2 the DCT transmission in

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094] The moment of inertia J 1 、J 2 、J 3 、J 4 、J 5 、J 6 equivalent to the input shaft when the DCT transmission is shifted into each gear in the above formula can be obtained through the specification parameter table in the DCT transmission, and then can be substituted into the above equations to solve for J ISouter 、J ISinner 、J OS1 and J OS2 . Thus, the equivalent process of the moment of inertia of the DCT transmission is completed.

[0095] In summary, the method for equivalent moment of inertia of the DCT transmission in the present invention obtains the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission; according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divides the moment of inertia of the DCT transmission into multiple parts of the moment of inertia; obtains the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear, and calculates the moment of inertia of each divided part according to the equivalent relationship of the moment of inertia of the gear pair. That is, it realizes the moment of inertia of the DCT transmission applicable to dynamic performance simulation based on the conventional transmission specification table and the transmission route schematic diagram, can effectively reduce the problem of difficult to obtain a relatively accurate equivalent moment of inertia in the process of building a dynamic simulation model using a certain mature DCT transmission, reduces the calculation amount, and reduces the dependence on DCT manufacturers.

[0096] Meanwhile, the embodiment of the present invention also provides a device for equivalent moment of inertia of the DCT transmission, which includes a collection module, a division module and a calculation module.

[0097] Among them, the collection module is used to obtain the transmission routes of each gear and the gear meshing relationships of each gear of the DCT transmission, the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear; the division module is used to divide the moment of inertia of the DCT transmission into multiple parts of the moment of inertia according to the shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point; the calculation module calculates the moment of inertia of each divided part according to the speed ratios of each gear of the DCT transmission and the main reduction ratio, the moment of inertia equivalent to the input shaft when the DCT transmission is shifted into each gear, and the equivalent relationship of the moment of inertia of the gear pair.

[0098] In some embodiments, the equivalent module divides the moment of inertia of the DCT transmission into multiple parts of the moment of inertia according to the shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, including:

[0099] Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission.

[0100] Regard the outer input shaft, the components fixedly connected to the outer input shaft, and the gears externally meshing with the gear fixedly connected to the outer input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission.

[0101] Regard the first output shaft, the components fixedly connected to the first output shaft, and the gears externally meshing with the gear fixedly connected to the first output shaft as a whole, and take the moment of inertia of this whole as the equivalent factor of the moment of inertia of the DCT transmission.

[0102] Regarding the second output shaft, the components fixedly connected to the second output shaft, and the gear that meshes externally with the gear fixedly connected to the second output shaft as a whole, and taking the moment of inertia of this whole as the equivalent factor of the DCT transmission's moment of inertia.

[0103] In some embodiments, the calculation module obtains the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculates the moments of inertia of each divided part according to the equivalent relationship of the moments of inertia of gear pairs, including:

[0104] Obtaining the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear;

[0105] Representing the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear by using the moments of inertia of each part as the equivalent factor;

[0106] Calculating the magnitudes of the moments of inertia of each part as the equivalent factor according to the magnitudes of the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear.

[0107] Furthermore, the calculation module according to the inertia equivalent to the input shaft = output shaft inertia * (speed ratio between the output shaft and the input shaft) 2 represents the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear by using the moments of inertia of each part as the equivalent factor.

[0108] In summary, the DCT transmission moment of inertia equivalent device in the present invention obtains the transmission routes of each gear of the DCT transmission and the gear meshing relationships of each gear; divides the DCT transmission moment of inertia into multiple parts of moments of inertia according to each shaft and the components on the shaft, with the clutch or synchronizer element as the demarcation point; obtains the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moments of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculates the moments of inertia of each divided part according to the equivalent relationship of the moments of inertia of gear pairs. That is, it realizes the DCT transmission moment of inertia applicable to dynamic performance simulation based on the conventional transmission specification table and the transmission route schematic diagram, effectively reduces the problem of difficult to obtain a relatively accurate equivalent moment of inertia during the process of building a dynamic simulation model using a certain mature DCT transmission, reduces the calculation amount, and reduces the dependence on DCT manufacturers.

[0109] At the same time, the present invention also provides a DCT transmission modeling method, which mainly involves a dual clutch module, a shafting module, and a shift mechanism module.

[0110] Among them, the modeling steps of the shafting module include:

[0111] Obtain the transmission routes of each gear of the DCT transmission and the gear meshing relationships of each gear;

[0112] According to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divide the rotational inertia of the DCT transmission into multiple parts of rotational inertia;

[0113] Obtain the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculate the rotational inertia of each divided part according to the equivalent relationship of the rotational inertia of the gear pair;

[0114] Build a shaft system module according to the power transmission path, the equivalent position of the equivalent rotational inertia, the selection of speed ratio and gear;

[0115] Mount the rotational inertia of each part on the equivalent position of the equivalent rotational inertia.

[0116] In some embodiments, the step of dividing the rotational inertia of the DCT transmission into multiple parts of rotational inertia according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, includes:

[0117] Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gears externally meshing with the gear fixedly connected to the inner input shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0118] Regard the outer input shaft, the components fixedly connected to the outer input shaft, and the gears externally meshing with the gear fixedly connected to the outer input shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0119] Regard the first output shaft, the components fixedly connected to the first output shaft, and the gears externally meshing with the gear fixedly connected to the first output shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission;

[0120] Regard the second output shaft, the components fixedly connected to the second output shaft, and the gears externally meshing with the gear fixedly connected to the second output shaft as a whole, and take the rotational inertia of this whole as the equivalent factor of the rotational inertia of the DCT transmission.

[0121] In some embodiments, the step of obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is in each gear, and calculating the rotational inertia of each divided part according to the equivalent relationship of the rotational inertia of the gear pair, includes:

[0122] Obtain the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the rotational inertia equivalent to the input shaft when the DCT transmission is in each gear;

[0123] The rotational inertia equivalent to each gear of the DCT transmission on the input shaft is represented by the rotational inertia of each part used as an equivalent factor;

[0124] According to the magnitude of the rotational inertia equivalent to each gear of the DCT transmission on the input shaft, calculate the magnitude of the rotational inertia of each part used as an equivalent factor.

[0125] Further, according to the inertia equivalent to the input shaft = output shaft inertia * (speed ratio between the output shaft and the input shaft) 2 , the rotational inertia equivalent to each gear of the DCT transmission on the input shaft is represented by the rotational inertia of each part used as an equivalent factor.

[0126] See Figure 3 As shown, still taking the above six - speed DCT transmission as an example, after determining the rotational inertia of each part, the shafting module can be built according to the power transmission path, the equivalent position of the equivalent rotational inertia, the speed ratio, and the selection of gears. That is Figure 3 the odd - numbered shaft inertia, even - numbered shaft inertia, first output shaft inertia, and second output shaft inertia in . Thus, the construction of the shafting module is completed. Through the shafting module, the output torque of the DCT transmission can be determined according to the input engine flywheel torque. In some preferred embodiments, considering the shafting efficiency MAP, a DCT efficiency module is also designed. The DCT efficiency module reflects the transmission efficiency of the DCT under various working conditions such as temperature and speed. It is not a fixed value and can reflect the transmission efficiency under different working conditions, which is closer to the actual situation in terms of the accuracy of the model.

[0127] For the dual - clutch module, its modeling steps include:

[0128] Determine the dynamic friction coefficient of the clutch according to the obtained clutch pressure P and the rotational speed difference between the driving and driven disks;

[0129] Obtain the inner diameter R of the friction surface of the clutch 内 , outer diameter R of the friction surface 外 and the number of friction surfaces N;

[0130] Take the smaller value between the dynamic friction coefficient and the static friction coefficient as μ, and build the dual - clutch module according to the clutch torque transmission formula

[0131] It should be noted that after determining the smaller value of the dynamic friction coefficient μ and the static friction coefficient, the smaller of the two is substituted into the clutch torque transmission formula for calculation, so that the clutch torque transmission can be determined by using the built - in dual - clutch module.

[0132] For the shift mechanism module, it mainly obtains the shaft gear change command and gear signal for modeling, which is well-known to those skilled in the art, and will not be elaborated in the embodiments of the present invention. Thereafter, by integrating the dual clutch module, the shaft system module and the shift mechanism module, the modeling of the DCT transmission can be completed.

[0133] In summary, the present invention proposes a modeling method for a DCT transmission model applicable to vehicle power performance simulation that can reflect the gear shifting process of the transmission. It uses the equivalent moment of inertia of the DCT transmission as multiple parts of the moment of inertia to build the shaft system module, effectively solving the problem of difficult to obtain a more accurate equivalent moment of inertia in the process of building a dynamic simulation model using a certain mature DCT transmission.

[0134] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for equivalent moment of inertia of a DCT transmission, characterized in that, the method comprises the following steps: Obtain the transmission routes of each gear of the DCT transmission and the gear meshing relationships of each gear; According to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divide the moment of inertia of the DCT transmission into multiple parts of moment of inertia; Obtain the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculate the moment of inertia of each divided part according to the equivalent relationship of the moment of inertia of the gear pair; The step of dividing the moment of inertia of the DCT transmission into multiple parts of moment of inertia according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, includes: Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gear that meshes externally with the gear fixedly connected to the inner input shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISinner ; Regard the external input shaft, the components fixedly connected to the external input shaft, and the gear that meshes externally with the gear fixedly connected to the external input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISouter ; Regard the first output shaft, the components fixedly connected to the first output shaft, and the gear that is externally meshed with the gear fixedly connected to the first output shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS1 ; Regard the second output shaft, the components fixedly connected to the second output shaft, and the gear that meshes externally with the gear fixedly connected to the second output shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS2 ; The step of obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculating the moment of inertia of each divided part according to the equivalent relationship of the moment of inertia of the gear pair, includes: Obtain the gear ratios i of the DCT transmission 1 、i 2 、i 3 、i 4 、i 5 、i 6 and two final drive ratios i fd1 and i fd2 , and the moments of inertia J equivalent to the input shaft when the DCT transmission is in each gear 1 、J 2 、J 3 、J 4 、J 5 、J 6 ; Express the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear by using the moment of inertia of each part as the equivalent factor; Calculate the magnitude of the moment of inertia of each part as the equivalent factor according to the magnitude of the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear; The specific expression of the magnitude of the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear is:

2. A device for equivalent moment of inertia of a DCT transmission, characterized in that, it includes: A collection module, which is used to obtain the transmission routes of each gear of the DCT transmission and the gear meshing relationships of each gear, the speed ratios of each gear of the DCT transmission and the main reduction ratio, and the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear; A division module, which is used to divide the moment of inertia of the DCT transmission into multiple parts of moment of inertia according to the shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point; A calculation module, which calculates the moment of inertia of each divided part according to the speed ratios of each gear of the DCT transmission and the main reduction ratio, the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and the equivalent relationship of the moment of inertia of the gear pair; The step of dividing the moment of inertia of the DCT transmission into multiple parts of moment of inertia according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, includes: Regard the inner input shaft, the components fixedly connected to the inner input shaft, and the gear that meshes externally with the gear fixedly connected to the inner input shaft as a whole, and take the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISinner ; Regard the external input shaft, the components fixedly connected to the external input shaft, and the gear that meshes externally with the gear fixedly connected to the external input shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISouter ; Regard the first output shaft, the components fixedly connected to the first output shaft, and the gear that meshes externally with the gear fixedly connected to the first output shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS1 ; Regard the second output shaft, the components fixedly connected to the second output shaft, and the gear that is externally meshed with the gear fixedly connected to the second output shaft as a whole, and take the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS2 ; The step of obtaining the corresponding speed ratios on the transmission routes of each gear of the DCT transmission, and the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculating the moment of inertia of each divided part according to the equivalent relationship of the moment of inertia of the gear pair, includes: Obtain the gear ratios i of the DCT transmission 1 、i 2 、i 3 、i 4 、i 5 、i 6 and two final drive ratios i fd1 and i fd2 , and the moments of inertia J of the DCT transmission in each gear equivalent to the input shaft 1 、J 2 、J 3 、J 4 、J 5 、J 6 ; Express the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear by using the moment of inertia of each part as the equivalent factor; Calculate the magnitude of the moment of inertia of each part as the equivalent factor according to the magnitude of the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear; The specific expression of the magnitude of the moment of inertia equivalent to the input shaft when the DCT transmission is engaged in each gear is:

3. A method for DCT transmission modeling, characterized in that, the method includes the shafting module modeling step, and the shafting module modeling step includes: Obtain the transmission routes of each gear of the DCT transmission and the meshing relationship of the gears in each gear; According to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point, divide the rotational inertia of the DCT transmission into multiple parts of rotational inertia; Obtain the corresponding gear ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculate the rotational inertia of each divided part according to the equivalent relationship of the rotational inertia of the gear pair; Build a shaft system module according to the power transmission path, the equivalent position of the equivalent rotational inertia, the gear ratio, and the selection of gears; Mount the rotational inertia of each part at the equivalent position of the equivalent rotational inertia; The step of dividing the rotational inertia of the DCT transmission into multiple parts of rotational inertia according to each shaft and the components on the shaft, and taking the clutch or synchronizer as the demarcation point includes: Regarding the inner input shaft, the components fixedly connected to the inner input shaft, and the gear that meshes externally with the gear fixedly connected to the inner input shaft as a whole, and taking the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISinner ; Regarding the external input shaft, the components fixedly connected to the external input shaft, and the gear that meshes externally with the gear fixedly connected to the external input shaft as a whole, and taking the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission ISouter ; Regarding the first output shaft, the components fixedly connected to the first output shaft, and the gear that meshes externally with the gear fixedly connected to the first output shaft as a whole, and taking the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS1 ; Regard the second output shaft, the components fixedly connected to the second output shaft, and the gear that meshes externally with the gear fixedly connected to the second output shaft as a whole, and use the moment of inertia of this whole as the equivalent factor J of the moment of inertia of the DCT transmission OS2 ; The step of obtaining the corresponding gear ratios on the transmission routes of each gear of the DCT transmission, and the rotational inertia equivalent to the input shaft when the DCT transmission is engaged in each gear, and calculating the rotational inertia of each divided part according to the equivalent relationship of the rotational inertia of the gear pair includes: Obtain the gear ratios i of the DCT transmission 1 、i 2 、i 3 、i 4 、i 5 、i 6 and two final drive ratios i fd1 and i fd2 , and the moments of inertia J equivalent to the input shaft when the DCT transmission is in each gear 1 、J 2 、J 3 、J 4 、J 5 、J 6 ; Express the rotational inertia equivalent to the input shaft when the DCT transmission is engaged in each gear using the rotational inertia of each part as the equivalent factor; Calculate the magnitude of the rotational inertia of each part as the equivalent factor according to the magnitude of the rotational inertia equivalent to the input shaft when the DCT transmission is engaged in each gear; The specific expression of the magnitude of the rotational inertia equivalent to the input shaft when the DCT transmission is engaged in each gear is:

4. A DCT transmission modeling method according to claim 3, characterized in that, further comprising: Build a DCT efficiency module according to the shaft system efficiency MAP.

5. A DCT transmission modeling method according to claim 4, characterized in that, further comprising the modeling steps of a dual clutch module, and the modeling steps of the dual clutch module include: Determine the dynamic friction coefficient of the clutch according to the obtained clutch pressure P and the rotational speed difference between the driving and driven disks; Obtain the inner diameter R of the friction surface of the clutch 内 , the outer diameter R of the friction surface 外 and the number N of friction surfaces; Take the smaller value of the dynamic friction coefficient and the static friction coefficient as μ. According to the clutch torque transmission formula Build a dual clutch module.

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