Transmission drive efficiency evaluation method and system

Abstract

The application provides a transmission drive efficiency evaluation method and system, tests the efficiency of each gear of the transmission under different speed rating torques, converts the input speed into the output speed by using the speed ratio, and then draws the efficiency under different gears in the rectangular coordinate system, so that the efficiency level of each gear under different output speeds can be directly observed, the output efficiency curve of each gear under different speeds is referred to, the gear with higher drive efficiency is compared in the same speed in the gear shifting process, and then the selection of the gear can be applied to reduce the energy consumption; meanwhile, the efficiency of different transmissions can be drawn in the same coordinate system for comparison, so that the high and low of the efficiency of different transmissions can be directly observed.

Description

Technical Field

[0001] This invention belongs to the field of transmission efficiency technology, specifically relating to a method and system for evaluating transmission efficiency. Background Technology

[0002] Transmission efficiency is an important indicator of transmission performance. Currently, OEMs have high requirements for transmission efficiency in order to achieve energy conservation, emission reduction, and lower operating costs.

[0003] However, currently, the only method for evaluating transmission efficiency is the comprehensive transmission efficiency specified in the national standard. Although OEMs test the transmission efficiency of transmissions at different speeds and torques, they only obtain efficiency data; there is no comparative method, let alone a way to compare the efficiency of transmissions from different manufacturers in the same torque range. Furthermore, there is no corresponding relationship between output speed, transmission efficiency, and gear position. Different gears at the same speed have different transmission efficiencies, and these differences in transmission efficiency determine different energy consumption at the same vehicle speed. Existing methods for evaluating transmission efficiency generally test at the input speed, making a direct and accurate evaluation impossible. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a method and system for evaluating the transmission efficiency of a transmission, which can accurately and intuitively evaluate the transmission efficiency of a transmission, reduce the fuel consumption of shifting gears, and also provide the efficiency levels of different transmissions.

[0005] This invention is achieved through the following technical solution:

[0006] A method for evaluating the transmission efficiency of a gearbox, characterized by comprising the following steps:

[0007] S1: Constant torque test of the transmission efficiency at different input speeds in each gear of the transmission;

[0008] S2: Uses the gear ratios of the transmission to convert the input speed into the output speed;

[0009] S3: Plot the transmission efficiency and output speed at different output speeds in each gear on a rectangular coordinate system, connect the high efficiency points of each gear, and form the output efficiency curve of the transmission at different speeds in each gear.

[0010] S4: Repeat steps S1-S3 to obtain the transmission efficiency of different models of transmissions with the same torque.

[0011] Furthermore, in step S1, the input rotational speed is 900-1600 rpm.

[0012] Further, the transmission efficiency in step S1 is 95.12%-99.50%.

[0013] Further, the input rotation speed in step S2 is 900-1600 / rpm.

[0014] Further, the output rotation speed in step S2 is 150-2162 / rpm.

[0015] Further, the speed ratio in step S2 is the ratio of the transmission input and output rotation speed, which is determined by the transmission gear transmission design parameters of each gear.

[0016] Further, in step S3, the horizontal coordinate in the rectangular coordinate system is the output rotation speed, and the vertical coordinate is the input rotation speed.

[0017] A transmission efficiency evaluation method system, characterized in that it comprises:

[0018] An input rotation speed transmission efficiency test module: for testing the transmission efficiency of each gear of the transmission at different input rotation speeds under a constant torque;

[0019] A rotation speed conversion module: for converting the input rotation speed into the output rotation speed by using the speed ratio of each gear of the transmission;

[0020] An output efficiency curve module: for drawing the transmission efficiency and output rotation speed at different output rotation speeds of each gear in the rectangular coordinate system, connecting the high points of each gear efficiency, and forming the output efficiency curve of the transmission at different rotation speeds of each gear. Compared with the prior art, the present application has the following beneficial technical effects:

[0021] The present application provides a transmission efficiency evaluation method and system, which tests the efficiency of each gear of the transmission at different rotation speed rated torque, converts the input rotation speed into the output rotation speed by using the speed ratio, and then draws the efficiency at different gears in the rectangular coordinate system. The efficiency level at different output rotation speeds of each gear can be directly observed, the output efficiency curve at different rotation speeds of each gear is referred to, the gear with higher transmission efficiency at the same rotation speed is selected in the shifting process, and the gear selection can be applied to reduce energy consumption. At the same time, the efficiency of different transmissions can be drawn in the same coordinate system for comparison, and the efficiency of different transmissions can be directly observed. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A transmission efficiency evaluation method flowchart in the embodiment of the present application;

[0023] Figure 2 A rectangular coordinate diagram of the transmission efficiency at different output rotation speeds of each gear in the embodiment of the present application;

[0024] Figure 3The schematic diagram of the maximum efficiency curve of the transmission formed by connecting the high efficiency points of each gear in the embodiment of the present application is shown in the figure.

[0025] Figure 4 The schematic diagram of the transmission efficiency of the transmission of different models with the same torque in the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with specific embodiments. The description is an explanation of the present application rather than a limitation.

[0027] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] The present application provides a transmission efficiency evaluation method, as shown in the figure, comprising the following steps: Figure 1

[0030] S1: testing the transmission efficiency of each gear of the transmission at different input speeds under a constant torque;

[0031] S2: converting the input speed into the output speed by using the speed ratio of each gear of the transmission;

[0032] S3: plotting the transmission efficiency and the output speed at different output speeds of each gear in a rectangular coordinate system, connecting the high efficiency points of each gear, and forming the output efficiency curve of the transmission at different speeds of each gear; specifically, as shown in the figure, selecting the 8th gear, and in the coordinate system, the horizontal coordinate is the speed, and the vertical coordinate is the transmission efficiency, to form the transmission efficiency curve at each speed; Figure 3

[0033] ​​S4: repeating steps S1-S3 until the transmission efficiency of different models of the same torque is obtained, specifically, as shown in Table 1, the transmission with 8 gears and the transmission with 12 gears are selected, and the different transmission efficiencies are calibrated at the same speed to obtain the transmission efficiency of different models of the same torque. Figure 4

[0034] A preferred embodiment of the present application is that the input speed in step S1 is 900-1600 / rpm, and further, the transmission efficiency in step S1 is 95.12%-99.50%; specifically, as shown in Table 1:

[0035] Table 1: Gear efficiency at different input speeds

[0036]

[0037] A preferred embodiment of the present application is that the input speed in step S2 is 900-1600 / rpm, and the output speed in step S2 is 150-2162 / rpm, specifically, as shown in Table 2:

[0038] Table 2: Output speed of each gear

[0039]

[0040] Specifically, the speed ratio in step S2 is the ratio of the input and output speeds of the transmission, which is determined by the gear transmission design parameters of each gear of the transmission.

[0041] Further, in step S3, the horizontal coordinate in the rectangular coordinate system is the output speed, and the vertical coordinate is the transmission efficiency of the input speed, specifically, as shown in Table 3: Figure 2 As shown in the table, the transmission efficiency corresponding to different gears is different at the same speed.

[0042] The present application provides an application of a transmission efficiency evaluation method, comprising the following steps:

[0043] Referring to the output efficiency curves at different speeds of each gear, the gear position with higher transmission efficiency at the same speed is compared in the shifting process.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A method of evaluating transmission drive efficiency, characterized by, The method comprises the following steps: S1: testing the transmission efficiency of each gear at different input speeds under a constant torque; S2: converting the input speed to the output speed using the speed ratio of each gear; S3: plotting the transmission efficiency and the output speed at different output speeds of each gear in a rectangular coordinate system, connecting the high points of the efficiency of each gear, and forming the output efficiency curve of the transmission at different speeds of each gear; S4: repeating steps S1-S3 until the transmission efficiency of the same torque of different models is obtained; The speed ratio in step S2 is the ratio of the input speed to the output speed, which is determined by the gear transmission design parameters of each gear of the transmission; In step S3, the horizontal coordinate in the rectangular coordinate system is the output speed, and the vertical coordinate is the transmission efficiency of the input speed; The input speed in step S1 is 900-1600 / rpm; The transmission efficiency in step S1 is 95.12%-99.50%; The input speed in step S2 is 900-1600 / rpm; The output speed in step S2 is 150-2162 / rpm.

2. A system for evaluating transmission drive efficiency, characterized by, The method for evaluating the transmission efficiency of a transmission according to claim 1, comprising: a transmission efficiency test module for testing the transmission efficiency of each gear at different input speeds under a constant torque; a speed conversion module for converting the input speed to the output speed using the speed ratio of each gear; an output efficiency curve module for plotting the transmission efficiency and the output speed at different output speeds of each gear in a rectangular coordinate system, connecting the high points of the efficiency of each gear, and forming the output efficiency curve of the transmission at different speeds of each gear.

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