Dynamic System Deformation Testing Method for New Energy Vehicle Reducers

Abstract

The present invention discloses a dynamic system deformation test method for a reducer of a new energy vehicle, comprising the following steps: 1) setting the overall speed ratio and the maximum torque; 2) starting the test bench; 3) obtaining the real-time input torque of the reducer; 4) judging whether the test system is operating normally; 5) the relative errors between the real-time torque and speed of the reducer and the target torque and speed of the reducer to be measured are both less than 3%; 6) conducting a dynamic system deformation test on the reducer and collecting data. The present invention can conduct experimental measurements on the dynamic system deformation of the reducer of a new energy vehicle, has high accuracy and reliability, and provides an efficient and accurate method for the stiffness evaluation of the new energy reducer.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle drive testing, and particularly to a dynamic system deformation testing method for a new energy vehicle reducer. Background Art

[0002] Compared with the traditional fuel system, the sound of the motor during operation is much smaller than that of the fuel engine. Therefore, the requirements for the NVH performance of the reducer are getting higher and higher. By accurately testing the dynamic system deformation of the reducer, it is possible to guide the overall stiffness design of the reducer and thereby reduce the NVH risk.

[0003] Through accurate dynamic system deformation testing of the reducer, the weak areas and transition strengthening areas of the reducer can be identified, guiding the lightweight design of the reducer.

[0004] When the reducer is actually working, it is installed on the new energy vehicle as a whole, and its deformation is a dynamic system deformation. At present, there have been many experimental studies on the static strength and deformation of new energy vehicle reducers, but there are few studies on the dynamic system deformation tests of reducers under working conditions. Summary of the Invention

[0005] The present invention provides a dynamic system deformation testing method for a new energy vehicle reducer, which can simulate the load borne by the new energy vehicle reducer during vehicle driving and perform experimental measurement on the dynamic system deformation of the reducer.

[0006] The technical solution to solve the above problems is as follows:

[0007] A dynamic system deformation testing method for a new energy vehicle reducer includes the following steps:

[0008] 1) Input the overall reduction ratio and maximum torque of the new energy vehicle reducer to be tested into the computer to dynamically match the torques and speeds of the driving motor and the loading motor;

[0009] 2) Start the test bench, and the industrial control computer in the test system supplies power to the driving motor and the loading motor;

[0010] 3) The driving motor amplifies the input end torque through a reducer with a large reduction ratio, the loading motor receives the output end torque through a reducer with a large reduction ratio, and the industrial control computer obtains the real-time input torque of the reducer to be tested through the torque sensor in the test system;

[0011] 4) The industrial control computer adjusts the torque and speed of the reducer to be tested to the maximum torque operating condition and maintains it. The industrial control computer monitors the real-time input torque and speed of the reducer to be tested, judges whether the test system is operating normally. If it is normal, the target torque and speed of the reducer to be tested are input through the industrial control computer to set the test condition. If it is not normal, reinstall the reducer to be tested;

[0012] 5) The industrial control computer adjusts the real-time torque and rotational speed of the reducer under test according to the set test conditions, so that the relative errors between the real-time torque and rotational speed of the motor under test and the target torque and rotational speed of the reducer under test are both less than 3%.

[0013] 6) Conduct a dynamic system deformation test on the reducer. The industrial control computer collects the initial electrical signals of the torque sensor and displacement sensor and the changing electrical signals during the movement of the reducer, converts the electrical signals into real-time data of torque and displacement through a computer and saves them, and obtains the deformation data based on the displacement data.

[0014] The advantages of the present invention are as follows:

[0015] 1. The present invention can simulate the real working conditions of high rotational speed and large torque of the reducer under test, and can meet a variety of reducers under test.

[0016] 2. The present invention is a dynamic system deformation test method. The test conditions are consistent with the working conditions of the reducer, greatly improving the authenticity of the test results.

[0017] 3. The test result of the displacement sensor of the present invention is the dynamic fluctuation data of the reducer, which conforms to the actual working deformation of the reducer.

[0018] 4. The present invention can conduct test measurements on the dynamic system deformation of the reducer of new energy vehicles, has high accuracy and reliability, and provides an efficient and accurate method for the stiffness evaluation of new energy reducers. Description of the Drawings

[0019] Figure 1 It is a flowchart of the analysis method of the present invention.

[0020] Figure 2 It is the bench layout and principle of the present invention. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be simply construed as a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0023] As Figure 1 and Figure 2 shown, the dynamic system deformation test method for the new energy vehicle reducer of the present invention adopts the following steps: 1) Set the overall reduction ratio and maximum torque; 2) Start the test bench; 3) Obtain the real-time input torque of the reducer; 4) Judge whether the test system is operating normally; 5) The relative errors between the real-time torque and speed of the reducer and the target torque and speed of the reducer under test are both less than 3%; 6) Conduct the dynamic system deformation test of the reducer and collect data. The following will explain each step in detail:

[0024] 1) Input the overall reduction ratio and maximum torque of the new energy vehicle reducer under test into the computer to dynamically match the torques and speeds of the driving motor and the loading motor. Preferably, before inputting the torque into the computer, the new energy vehicle reducer is also installed on the test bench in the real vehicle installation and positioning manner to ensure that the target torque and speed of the reducer under test within the test range of the dynamic system deformation.

[0025] 2) Start the test bench, and the industrial control computer in the test system supplies power to the driving motor and the loading motor.

[0026] 3) The driving motor amplifies the input-end torque through a reducer with a large reduction ratio, the loading motor receives the output-end torque through a reducer with a large reduction ratio, and the industrial control computer obtains the real-time input torque of the reducer under test through the torque sensor in the test system;

[0027] 4) The industrial control computer adjusts the torque and speed of the reducer under test to the maximum torque operating condition and maintains it. The industrial control computer monitors the real-time input torque and speed of the reducer under test to judge whether the test system is operating normally. If it is normal, the target torque and speed of the reducer under test are input through the industrial control computer to set the test condition. If it is not normal, reinstall the reducer under test;

[0028] 5) The industrial control computer adjusts the real-time torque and speed of the reducer under test according to the set test condition, so that the relative errors between the real-time torque and speed of the motor under test and the target torque and speed of the reducer under test are both less than 3%;

[0029] 6) Conduct the dynamic system deformation test of the reducer. The industrial control computer collects the initial electrical signals of the torque sensor and the displacement sensor and the changing electrical signals during the movement of the reducer. The computer converts the electrical signals into real-time data of torque and displacement and saves them, and obtains the deformation data based on the displacement data. The detected value of the displacement sensor is the dynamic fluctuation deformation of the reducer.

[0030] Preferably, in step 1), the industrial control computer dynamically matches the torque and speed of the drive motor and the loading motor by identifying the overall speed ratio given by the computer.

[0031] Preferably, in step 3), the drive motor amplifies the input-end torque through a reducer with a large speed ratio to meet the requirement of the reducer for a large input torque. The large speed ratio is 28 to 32 times the speed ratio. In this embodiment, the large speed ratio preferably adopts 30 times the speed ratio.

[0032] Preferably, in step 4), the judgment criterion for whether the test system operates normally is that the relative errors between the real-time torque and speed of the reducer under test and the target torque and speed of the reducer under test are both less than 3%.

[0033] Preferably, in step 6), when the displacement sensor tests the deformation of the reducer, the reducer is in a dynamic balance state under the combined action of the drive motor and the loading motor. Among them, the drive motor is the motor at the input end of the reducer, and the loading motor is the motor at the output end of the reducer.

[0034] During the test, sometimes not only the maximum torque is tested, but also some other torques, such as 50% of the maximum torque. Therefore, in order to test different dynamic deformations, different torques are input into the computer respectively, and then steps 2) to 6) are repeated to test the deformation of the reducer to be tested under different torques, and multiple deformation data are obtained through the test, so as to be able to analyze the dynamic deformation situation more accurately.

[0035] In summary, the above solution of the present invention can simulate the loads borne by the new energy vehicle reducer during vehicle driving, conduct experimental measurements on the dynamic system deformation of the reducer, and has high accuracy, such as more than 90% accuracy, providing an efficient and accurate method for the stiffness test of the new energy reducer, and at the same time providing data support for the design of the reducer.

[0036] The above is a detailed description of the technical solution. It should be understood that due to the limitations of the text and the diversity of the technical solutions, those skilled in the art can also implement the technical solution through equivalent replacements of the text, grammar or others of the technical solution. Therefore, such replacements should all be regarded as within the protection scope of this application.

Claims

1. A method for testing the dynamic system deformation of a new energy vehicle reducer, characterized by including the following steps: 1) Input the overall speed ratio and maximum torque of the new energy vehicle reducer to be tested into a computer to dynamically match the torques and speeds of the driving motor and the loading motor; 2) Start the test bench, and the industrial control computer in the test system supplies power to the driving motor and the loading motor; 3) The driving motor amplifies the input torque at the input end through a reducer with a large speed ratio, the loading motor receives the output torque through a reducer with a large speed ratio, and the industrial control computer obtains the real-time input torque of the reducer to be tested through the torque sensor in the test system; 4) The industrial control computer adjusts the torque and speed of the reducer to be tested to the maximum torque operating condition and maintains it. The industrial control computer monitors the real-time input torque and speed of the reducer to be tested to judge whether the test system is operating normally. If it is normal, the industrial control computer inputs the target torque and speed of the reducer to be tested to set the test condition. If it is not normal, reinstall the reducer to be tested; 5) The industrial control computer adjusts the real-time torque and speed of the reducer to be tested according to the set test condition, so that the relative errors between the real-time torque and speed of the tested motor and the target torque and speed of the reducer to be tested are both less than 3%; 6) Conduct the dynamic system deformation test of the reducer. The industrial control computer collects the initial electrical signals of the torque sensor and the displacement sensor and the changing electrical signals during the movement of the reducer, converts the electrical signals into real-time data of torque and displacement through a computer and saves them, obtains the deformation data according to the displacement data, and when the displacement sensor tests the deformation of the reducer, the reducer is in a dynamic balance state under the combined action of the driving motor and the loading motor; 7) Input different torques into the computer respectively, and then repeat steps 2) to 6) to test the deformation conditions of the reducer to be tested under different torques.

2. The dynamic system deformation test method for the new energy vehicle reducer according to claim 1, wherein: In step 1), the industrial control computer dynamically matches the torques and speeds of the driving motor and the loading motor by identifying the overall speed ratio given by the computer.

3. The dynamic system deformation test method for a new energy vehicle reducer according to claim 1, characterized in that: In step 3), the driving motor amplifies the input torque at the input end through a reducer with a large speed ratio to meet the requirement of large input torque of the reducer.

4. The dynamic system deformation test method for a new energy vehicle reducer according to claim 1, characterized in that: In step 4), the judgment criterion for whether the test system is operating normally is that the relative errors between the real-time torque and speed of the reducer to be tested and the target torque and speed of the reducer to be tested are both less than 3%.

5. The dynamic system deformation test method for a new energy vehicle reducer according to claim 1, wherein Input different torques into the computer respectively, and repeat steps 2) to 6) to test the deformation conditions of the reducer to be tested under different torques.

6. The dynamic system deformation test method for a new energy vehicle reducer according to claim 1, characterized in that The detected value of the displacement sensor is the dynamic fluctuation deformation of the reducer.

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