CN114037328B - Efficiency distribution optimization method for vehicle transmission - Google Patents

Efficiency distribution optimization method for vehicle transmission Download PDF

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CN114037328B
CN114037328B CN202111370633.8A CN202111370633A CN114037328B CN 114037328 B CN114037328 B CN 114037328B CN 202111370633 A CN202111370633 A CN 202111370633A CN 114037328 B CN114037328 B CN 114037328B
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桂鹏
邹天刚
侯潇男
吴维
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China North Vehicle Research Institute
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Abstract

The application discloses an efficiency distribution optimization method for vehicle transmission, which comprises the following steps: establishing a new product overall efficiency index based on the power data and efficiency data of the existing transmission assembly; respectively establishing component efficiency indexes of all transmission components based on power data and efficiency data of the existing transmission components, and correcting the overall efficiency indexes of the new product; obtaining part efficiency indexes of the transmission parts through power loss among the transmission parts in the transmission parts, and correcting the part efficiency indexes; and obtaining an efficiency distribution correction coefficient based on the corrected overall efficiency index and the test efficiency index of the new product, wherein the efficiency distribution correction coefficient is used for correcting the component efficiency index and the part efficiency index to finish the efficiency distribution optimization method. The method and the device can distribute and predict the efficiency index of the whole machine aiming at each transmission part of the transmission system, and achieve the purpose of improving the efficiency of a new product.

Description

Efficiency distribution optimization method for vehicle transmission
Technical Field
The application belongs to the technical field of vehicle transmission, and particularly relates to an efficiency distribution optimization method for vehicle transmission.
Background
In a vehicle transmission system, there are often many transmission components that have significant power losses during operation. The power loss of the vehicle transmission part not only causes the waste of output power and influences the efficiency of a transmission system, but also causes the temperature rise and influences the service life of the transmission part so as to influence the performance of the whole vehicle. Therefore, in order to reduce the power loss of vehicle transmission, a higher overall efficiency index needs to be provided for a new product, and the overall efficiency index needs to be distributed to each transmission component of the transmission system. At present, aiming at a vehicle transmission system, an efficiency distribution flow of the system is lacked, and the efficiency distribution flow can be used for distributing the whole efficiency index according to a transmission part and checking and correcting through efficiency test data.
Disclosure of Invention
The application provides an efficiency distribution optimization method for vehicle transmission, which preliminarily determines the overall efficiency index of a new product through a fitting method according to the existing test database; based on the analysis of power flow, the overall efficiency index is preliminarily distributed to each transmission part through the existing test data or empirical formula, and preliminary prediction is carried out; redistributing the efficiency of each transmission component to a sub-assembly or part and forecasting; and checking and correcting the efficiency index through an efficiency test.
In order to achieve the above purpose, the present application provides the following solutions:
a method for optimizing efficiency allocation for a vehicle transmission, comprising the steps of:
establishing a new product overall efficiency index based on the power data and efficiency data of the existing transmission assembly;
respectively establishing component efficiency indexes of all transmission components based on power data and efficiency data of the existing transmission components, and correcting the overall efficiency indexes of the new product;
obtaining part efficiency indexes of the transmission parts through power loss among the transmission parts in the transmission parts, and correcting the part efficiency indexes;
and obtaining an efficiency distribution correction coefficient based on the corrected overall efficiency index and the test efficiency index of the new product, wherein the efficiency distribution correction coefficient is used for correcting the component efficiency index and the part efficiency index to finish the efficiency distribution optimization method.
Optionally, the method for establishing the overall efficiency index of the new product includes:
based on the power data and the efficiency data of the existing transmission assembly, a transmission efficiency fitting curve between power and efficiency is established by using a fitting method;
and obtaining the overall efficiency index of the new product based on the transmission efficiency fitting curve and the output power of the new product.
Optionally, the method for establishing the component efficiency index includes:
and establishing a part efficiency fitting curve between the power and the efficiency of the transmission part by using a fitting method based on the existing power data and efficiency data of the transmission part, and obtaining the part efficiency index.
Optionally, the method for obtaining the efficiency index of the part includes:
establishing a power loss function between transmission parts;
and obtaining the efficiency index of the part according to the power loss function and the input power of the transmission part.
Optionally, the power loss among the transmission parts includes gear oil stirring power loss, gear meshing power loss and bearing friction power loss.
Optionally, the calculation method of the power loss of the gear oil stirring includes:
Figure BDA0003361952570000031
optionally, the calculation method of the gear meshing power loss includes:
P m ＝fF n V s /1000+90000V r hbε
optionally, the calculation method of the friction power loss of the bearing includes:
Figure BDA0003361952570000032
the beneficial effect of this application does:
the application discloses an efficiency distribution optimization method for vehicle transmission, which can determine the overall efficiency index of a new product through data fitting according to the data of the existing database; the distribution and prediction of the overall efficiency index can be carried out aiming at each transmission part of the transmission system; the efficiency index and the efficiency distribution can be checked and corrected through a transmission part and a complete machine rack efficiency test. The efficiency distribution and the efficiency test data inspection and correction are carried out on the transmission part, so that the purpose of improving the efficiency of new products is achieved.
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In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart illustrating an efficiency distribution optimization method for a vehicle transmission according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a flow chart of an efficiency distribution optimization method for a vehicle transmission according to an embodiment of the present application is shown, and mainly includes the following steps:
the first step, based on the power data and efficiency data of the existing transmission assembly, the overall efficiency index of a new product is established.
In the embodiment, data fitting is performed based on power data and efficiency data of the existing transmission assembly to obtain a vehicle transmission efficiency fitting curve; based on the fitting curve, the overall efficiency index of a new product is preliminarily determined.
Specifically, in the present embodiment, it is known that the output power is x 1 ,x 2 ,…,x n In time, vehicle drive trainThe system efficiency is respectively y 1 ,y 2 ,…,y n According to the output power and efficiency, the curve y ═ f (x) of output power and efficiency can be fitted, and the output power of the new product is set to x n+1 According to the curve of output power and efficiency, y ═ f (x), the overall efficiency index y of new product can be preliminarily determined n+1 。
And secondly, obtaining part efficiency indexes of all transmission parts through power loss among the transmission parts in the transmission parts, and correcting the part efficiency indexes.
The method comprises the steps of analyzing a transmission system based on power flow, establishing a part efficiency fitting curve between power and efficiency of a transmission part by using a fitting method through power test data and efficiency test data of the existing transmission part and an empirical formula, and obtaining a part efficiency index.
Generally, the transmission components of a vehicle transmission system mainly include: front transmission, a hydraulic torque converter, a clutch and a brake, a steering pump motor, a planetary speed change mechanism, an oil seal and a dynamic seal. As set forth in step one, the efficiency of the front drive, torque converter, clutches and brakes, steering pump motor, planetary transmission mechanism is predicted from the test data. The output power and efficiency curve y 'f' (x) is fitted through the existing test data, and the efficiency index y 'of each transmission component is obtained' i Wherein i is 1,2, …, k is the number of transmission components.
Wherein y is n+1 =y′ 1 ·y′ 2 ·…·y′ k 。
And thirdly, obtaining part efficiency indexes of all transmission parts through power loss among the transmission parts in the transmission parts, and correcting the part efficiency indexes.
The efficiency of the individual transmission components is redistributed to the subassemblies and components and predicted.
Typically, the front transmission components include gears, bearings, etc., and their power losses include gear churning power losses, gear meshing power losses, and bearing friction power losses.
The gear oil stirring power loss calculation formula is as follows:
Figure BDA0003361952570000051
in the formula (f) g Is a gear infiltration factor; d is the gear pitch circle diameter, unit: millimeter; a. the g To configure the constants, usually take A g 0.2; b is the tooth width, unit: millimeter; β is helix angle, unit: degree; r is f Is a tooth surface roughness factor; v is the kinematic viscosity of the lubricating oil at operating temperature, in units: mm is 2 S; n is the rotation speed, unit: r/min.
The calculation formula of the gear meshing power loss is as follows:
P m ＝fF n V s /1000+90000V r hbε (2)
wherein f is the coefficient of friction; f n Average normal load, unit: n; v s Average slip speed, unit: m/s; v r Average scrolling speed, unit: m/s; h is the oil film thickness, unit: m; b is the tooth width, unit: m (for gear pair, the tooth width is smaller); ε represents the degree of coincidence.
The calculation formula of the friction power loss of the bearing is as follows:
Figure BDA0003361952570000061
in the formula (d) m Is the ball bearing pitch circle diameter, unit: mm; f β Equivalent dynamic load for a ball bearing, unit: n; f. of 1 Is a coefficient related to bearing structure and load; n is the bearing speed, unit: r/min; v is the kinematic viscosity of the lubricating oil, unit: mm is 2 /s；f 2 Is a constant related to the type of bearing and the manner of lubrication.
Reducing power losses in the front drive gears and bearings can improve efficiency. For example, according to the equations (1) and (2), the power loss of the gear can be reduced by reducing the tooth width b and the pitch diameter D, and the efficiency can be improved. Thus, the efficiency index assigned to a gear is:
Figure BDA0003361952570000062
in the formula, P ing For gear input power, unit: kW.
Similarly, the efficiency index of the parts such as the bearing is y ″) 2 …, the front drive component efficiency index may be further modified to:
y′ 1 ＝y″ 1 ·y″ 2 ·… (5)
and fourthly, obtaining an efficiency distribution correction coefficient based on the corrected overall product efficiency index and the test efficiency index of the new product, wherein the efficiency distribution correction coefficient is used for correcting the component efficiency index and the part efficiency index, and the efficiency distribution optimization method is completed.
And aiming at the efficiency distribution of the transmission parts, carrying out the efficiency test of the transmission parts, checking and correcting the efficiency distribution of the transmission parts based on the efficiency test data of the part rack and the efficiency test data of the whole machine rack, and supplementing the efficiency test data to a database.
For example, the test efficiency of the whole machine is measured as y based on the test bed of the whole machine bench t Then, the obtained efficiency distribution correction coefficient is:
Figure BDA0003361952570000071
further, the efficiency distribution index may be corrected according to the efficiency distribution correction coefficient.
In this embodiment, the test data is supplemented to the existing database to better optimize transmission efficiency.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application.

Claims (5)

1. A method for optimizing the distribution of efficiency of a vehicle transmission, comprising the steps of:
based on the power data and efficiency data of the existing transmission assembly, a fitting curve of transmission efficiency between power and efficiency is established by using a fitting method, based on the fitting curve of transmission efficiency and the output power of a new product, an index of the overall efficiency of the new product is established, and the output powers are set to be respectivelyx 1 ,x 2 ,…,x n When the vehicle driveline efficiency is respectivelyy 1 ,y 2 ,…,y n Fitting an output power versus efficiency curve based on the output power and efficiencyy=f(x) Setting the output power of the known new product tox n+1 According to the output power versus efficiency curvey=f(x) Determining the overall efficiency index of a new producty n+1 ；
Based on the power data and efficiency data of the existing transmission components, a fitting method is used for establishing a component efficiency fitting curve between the power and the efficiency of the transmission components, component efficiency indexes of the transmission components are respectively established, the overall efficiency index of the new product is corrected, and the existing test data are used for fitting an output power and efficiency curve
Figure DEST_PATH_IMAGE001
Obtaining the efficiency index of each transmission part
Figure 541928DEST_PATH_IMAGE002
Wherein i =1,2, …, k, k is the number of transmission components, wherein
Figure DEST_PATH_IMAGE003
；
Redistributing the efficiency of each transmission component to a sub-assembly and components through the power loss among transmission components in the transmission components to obtain the component efficiency index of each transmission component, and correcting the component efficiency index;
obtaining an efficiency distribution correction coefficient based on the corrected overall efficiency index and the test efficiency index of the new product, wherein the efficiency distribution correction coefficient is used for correcting the component efficiency index and the part efficiency index to complete an efficiency distribution optimization method;
the method for obtaining the efficiency index of the part comprises the following steps:
establishing a power loss function between transmission parts;
and obtaining the efficiency index of the part according to the power loss function and the input power of the transmission part.
2. The method of optimizing efficiency distribution for a vehicle transmission of claim 1 wherein said power losses between transmission parts include gear churning power losses, gear mesh power losses and bearing friction power losses.
3. The method of optimizing efficiency allocation for a vehicle transmission according to claim 2 wherein said gear churning power loss is calculated by:
Figure 629707DEST_PATH_IMAGE004
；
in the formula (I), the compound is shown in the specification,f g is a gear infiltration factor;Dis the gear pitch circle diameter, unit: millimeter;A g to configure the constants, takeA g =0.2；bIs the tooth width, unit: millimeter;βhelix angle, unit: degree;R f is a tooth surface roughness factor;vkinematic viscosity of lubricating oil, unit: mm is 2 /s；nIs the rotation speed, unit: r/min.
4. The efficiency distribution optimization method for a vehicle transmission according to claim 2, wherein the gear mesh power loss is calculated by:
Figure DEST_PATH_IMAGE005
；
in the formula (I), the compound is shown in the specification,fis the coefficient of friction;F n average normal load, unit: n;V s average slip speed, unit: m/s;V r average scrolling speed, unit: m/s;hoil film thickness, unit: m;bis the tooth width, unit: m;εthe degree of coincidence is.
5. The efficiency distribution optimization method for a vehicle transmission according to claim 2, characterized in that the calculation method of the bearing friction power loss is:
Figure 143865DEST_PATH_IMAGE006
；
in the formula (I), the compound is shown in the specification,d m is the ball bearing pitch circle diameter, unit: mm;F β equivalent dynamic load for a ball bearing, unit: n;f 1 is a coefficient related to bearing structure and load;nis the rotation speed, unit: r/min;vkinematic viscosity of lubricating oil, unit: mm is 2 /s；f 2 Is a constant related to the type of bearing and the manner of lubrication.
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