A new energy vehicle double electric drive assembly against towing test system

Abstract

The application discloses a new energy automobile double-electric-drive assembly towing test system, which comprises a bidirectional direct-current power supply, a cooling control system, an assembly rack system and an upper computer control and acquisition system, wherein the assembly rack system comprises a dynamometer, a gear box, a shaft coupling, a rotating speed / rotating torque measuring device, a fixed support and a movable slide rail; the upper computer control and acquisition system comprises an upper computer control cabinet and a data acquisition system; and the gear box comprises two first-stage transmission gear boxes and one two-stage transmission gear box. The system realizes double-electric-drive assembly towing test by using only a single dynamometer, reduces test cost and improves test efficiency; the problem that one of the double-electric-drive assemblies is in an electric state and the other is in a power feeding state is avoided, and the use scene under the whole vehicle state is truly simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile testing, in particular to a new energy vehicle double electric drive assembly against-pull test system. BACKGROUND

[0002] In recent years, under the joint promotion of policy and market, the new energy vehicle market has maintained rapid development. As the "heart" of new energy vehicles, the electric drive assembly plays the role of "engine, vehicle control unit, transmission" in fuel vehicles, and has a great influence on the use performance of new energy vehicles. According to the test standards of major domestic and foreign automobile manufacturers and third-party suppliers, the electric drive assembly usually needs to be tested for thousands of hours of durability and reliability. The test conditions simulate the vehicle use environment, which usually includes peak torque load of forward driving vehicle, medium and low torque load of reverse driving vehicle, small torque load of feeding during downhill and braking, and other common forward driving loads. At present, this verification test can only be carried out on a double dynamometer bench, and only one set of electric drive assembly can be tested at a time, which is high in testing cost and low in testing efficiency. For example, Chinese patent authorization publication No. CN112834838A discloses an electric drive assembly test device, which comprises a bidirectional direct current power supply, an environmental box, a water temperature control system, a connecting shaft and a special reduction gearbox. The special reduction gearbox and the electric drive assembly are arranged in the environmental box, the bidirectional direct current power supply is arranged outside the environmental box and is used for power supply of the electric drive assembly, the water temperature control system is arranged outside the environmental box and is used for water temperature control of the electric drive assembly and the special reduction gearbox, and the connecting shaft is used for connection between the electric drive assembly and the special reduction gearbox or connection between two special reduction gearboxes. When the two special reduction gearboxes are arranged oppositely, the transmission ratios of the first shaft and the intermediate shaft and the third shaft and the intermediate shaft are both 1:1, and the two electric drive assemblies are arranged between the two first shafts and the two third shafts respectively, the back-to-back against-pull durability test of the two electric drive assemblies can be realized, which has lower cost, better adaptability and test convenience than the existing double dynamometer test scheme. However, when one electric drive assembly is in the electric state, the other electric drive assembly is in the feeding state, that is, one electric drive assembly is in the electric positive tooth surface engagement state, and the other electric drive assembly is in the feeding reverse tooth surface engagement state. When the electric drive assembly in the electric state works under large torque, the other electric drive assembly must work under the same torque in the feeding state. Finally, only one electric drive assembly simulates the working mode under the whole vehicle state, and in a strict sense, it is still a test system that can only test one electric drive assembly. At the same time, there is a "flying car" problem at the peak torque working condition. SUMMARY

[0003] The present application mainly aims at solving the problem of high test cost and low test efficiency in the existing durability and reliability test of new energy vehicle electric drive assembly, that is, a set of double dynamometers can only test a set of electric drive assembly, and provides a new energy vehicle double electric drive assembly test system, comprising a bidirectional DC power supply, a cooling control system, an assembly bench system and an upper computer control and acquisition system, the assembly bench system comprises a dynamometer, a gear box, a shaft coupling, a rotating speed / torque measuring device, a fixed support and a movable slide rail, the upper computer control and acquisition system comprises an upper computer control cabinet and a data acquisition system, and the gear box comprises two first-stage transmission gear boxes and one two-stage transmission gear box.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The application discloses a new energy vehicle double electric drive assembly pair-drag test system, which comprises an assembly bench system and an upper computer control and collection system, the assembly bench system comprises a dynamometer, a gear box and a shaft coupling, the gear box comprises two first-stage transmission gear boxes and one two-stage transmission gear box, the electric drive assembly is in transmission connection with the first-stage transmission gear box and the two-stage transmission gear box through the shaft coupling respectively, the dynamometer is in transmission connection with the two-stage transmission gear box through the shaft coupling, and the two-stage transmission gear box is in transmission connection with the first-stage transmission gear box through the shaft coupling. The application uses one dynamometer to test two electric drive assemblies, each electric drive assembly comprises a frequency conversion controller, a drive motor driven and controlled by the frequency conversion controller, a speed reducer and a differential, and the differential comprises a front power output end and a rear power output end. The two electric drive assemblies are arranged between a first shaft of the first-stage transmission gear box and a first shaft of the two-stage transmission gear box respectively, and are connected with the two gear boxes arranged on the two sides through the shaft couplings respectively, so as to transmit the rotation speed and torque between the two output shafts. When it is necessary to simulate the temperature and humidity conditions in the use of the vehicle, an environmental box is arranged, the two electric drive assemblies are arranged in the environmental box, the gear boxes are arranged at the positions outside the environmental box, the environmental box is provided with shaft coupling channels, water inlet and outlet pipe channels and high and low voltage cable inlet and outlet channels, and the whole environmental box is separated into upper and lower parts, so that the installation operation is convenient. The electric drive assembly, the first-stage transmission gear box, the two-stage transmission gear box, the dynamometer and the two-stage transmission gear box and the first-stage transmission gear box and the two-stage transmission gear box are in transmission connection through the shaft couplings, so as to transmit the torque and rotation speed. The application takes the two electric drive assemblies to be tested as driving sources, takes a single dynamometer as an accompanying test power source, makes the two electric drive assemblies to be tested in the electric mode at the same time, realizes the test pair-drag at the high torque and high power point, and can artificially set the power feeding working condition to the electric drive assemblies to be tested through the upper computer control cabinet, so that the electric drive assemblies work in the low torque and low power feeding state, and the working mode of the whole vehicle is better simulated.

[0006] Preferably, the upper computer control and collection system comprises an upper computer control cabinet and a data collection system, and the upper computer control cabinet is connected with the electric drive assemblies and the dynamometer through CAN buses respectively. The upper computer control cabinet is connected with the electric drive assemblies on the two test stations through CAN buses respectively, so as to send control signals and receive feedback signals. During the test, the upper computer control cabinet outputs torque signals and rotation speed signals to the electric drive assemblies and the dynamometer respectively, so as to control the operation states of the electric drive assemblies and the dynamometer, and realize the switching of the electric drive assemblies between the electric mode and the power feeding mode.

[0007] Preferably, the assembly bench system further comprises a rotation speed / torque measuring device, and the rotation speed / torque measuring device is connected with the data collection system through an Ethernet. The rotation speed / torque measuring device is used for detecting the rotation speed and torque of the shaft coupling and outputting to the data collection system.

[0008] As preferred, the rotation speed / torque measuring devices are respectively arranged on the shaft couplings of the power output ends of the electric drive assemblies and the shaft coupling of the output end of the dynamometer.

[0009] As preferred, a bidirectional DC power supply and a cooling control system are further included, the bidirectional DC power supply is electrically connected with the electric drive assemblies and the dynamometer respectively, and the cooling control system is connected with the two power output ends of the electric drive assemblies and the cooling interface of the gear box through water pipes respectively. The bidirectional DC power supply is electrically connected with the electric drive assemblies and the dynamometer to supply power for them. The cooling control system is connected with the two power output ends of the electric drive assemblies and the cooling interface of the gear box through water pipes respectively to control the temperature and flow of the cooling liquid of the electric drive assemblies and the gear box.

[0010] As preferred, the electric drive assemblies, the dynamometer and the two-stage transmission gear box are fixed on the base through fixing supports. Two parallel and spaced test stations are arranged on the base, and the two electric drive assemblies are fixed on the test stations through fixing supports. One test platform can simultaneously test two electric drive assemblies, which can effectively reduce the test cost and double the test efficiency.

[0011] As preferred, a movable slide rail is further included, the movable slide rail comprises a guide rail and a movable platform moving forward and backward along the guide rail, and the primary transmission gear box is fixed on the movable platform through a fixing support, and the guide rail is fixed on the base. The primary transmission gear box is fixed on the movable platform which can move forward and backward, and the forward and backward movement of the movable platform on the guide rail ensures the installation space of the electric drive assemblies to adapt to the space installation requirements of different size samples and facilitate the installation operation of the test. When the sample is fixed, the movable platform will be fixed and cannot move.

[0012] As preferred, an odd number of gear sets are arranged in the two-stage transmission gear box. An odd number of gear sets are arranged in the two-stage transmission gear box to ensure that the rotation directions of the two electric drive assemblies and the dynamometer are consistent. When the electric drive assemblies operate in the electric mode, the dynamometer operates in the feeding mode.

[0013] As preferred, a universal joint is arranged in the middle of the shaft coupling. In order to facilitate the installation and steering connection of the shaft coupling, flanges are arranged at both ends of the shaft coupling, and a universal joint is arranged in the middle. The output ends of the primary transmission gear box and the two-stage transmission gear box also adopt the flange scheme to match the flange end faces of the shaft couplings.

[0014] As preferred, the transmission ratio of the first shaft and the second shaft of the primary transmission gear box is 1:1, and the transmission ratio of the first shaft, the intermediate shaft and the third shaft of the two-stage transmission gear box is 1:1:1.

[0015] Therefore, the advantages of the present application are:

[0016] (1) By means of ingenious design of gear box, the double dynamometer scheme is replaced, only single dynamometer system is needed, the mutual towing test ability of double electric drive assembly can be realized, the construction investment of test bench is reduced, and the structure is simpler;

[0017] (2) The double electric drive assembly test platform in the true sense is constructed, two electric drive assemblies can work in electric state or power feeding state at the same time, the power output in low load area and high load, high power area can be met at the same time, the ability requirement of electric drive assembly working in the whole external characteristic range is realized, the problem that one is in electric state and one is in power feeding state when double electric drive assemblies are towed is avoided, and the use scene in the whole vehicle state is more truly simulated;

[0018] (3) The moving slide rail scheme is adopted, and the adaptability and test convenience in shaft coupling installation and electric drive assembly clamping are stronger. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of a new energy automobile double electric drive assembly towing test system in the embodiment of the application.

[0020] Figure 2 It is a structure schematic view of a moving slide rail in the embodiment of the application.

[0021] Figure 3 It is a structure schematic view of a gear box in the embodiment of the application.

[0022] 1, bidirectional DC power supply 2, cooling control system 3, upper computer control cabinet 4, data acquisition system 5, primary transmission gear box 6, dynamometer 7, two-stage transmission gear box 8, shaft coupling 9, rotation speed / torque measuring device 10, electric drive assembly 11, moving platform 12, guide rail. DETAILED DESCRIPTION

[0023] The application will be further described below in combination with the drawings and specific embodiments.

[0024] A new energy automobile double electric drive assembly towing test system, as Figure 1As shown, it comprises a bidirectional DC power supply 1, a cooling control system 2, an assembly rack system and an upper computer control and acquisition system, the assembly rack system comprises a dynamometer 6, a gear box, a shaft coupling 8, a rotational speed / torque measuring device 9, a fixed support and a movable slide rail; the upper computer control and acquisition system comprises an upper computer control cabinet 3 and a data acquisition system 4; the gear box comprises two one-stage transmission gear boxes 5 and one two-stage transmission gear box 7. The bidirectional DC power supply 1 is electrically connected with the electric drive assembly 10 and the dynamometer 6 respectively; the cooling control system 2 is water-pipe connected with two power output ends of the electric drive assembly 10 and a cooling interface of the gear box respectively; the electric drive assembly 10 is transmissionally connected with the one-stage transmission gear box 5 and the two-stage transmission gear box 7 through the shaft coupling 8 respectively; the dynamometer 6 is transmissionally connected with the two-stage transmission gear box 7 through the shaft coupling 8; the two-stage transmission gear box 7 is transmissionally connected with the one-stage transmission gear box 5 through the shaft coupling 8; the upper computer control cabinet 3 is connected with the electric drive assembly 10 and the dynamometer 6 through a CAN bus respectively; the rotational speed / torque measuring device 9 is connected with the data acquisition system 4 through an Ethernet.

[0025] This embodiment uses a dynamometer 6 to test two electric drive assemblies 10, each electric drive assembly 10 comprises a frequency conversion controller, a drive motor driven and controlled by the frequency conversion controller, a speed reducer and a differential, the differential comprises a front power output end and a rear power output end. Two parallel and interval test stations are arranged on the base, and the two electric drive assemblies 10 are fixed on the test stations through the fixed supports. The dynamometer 6 and the two-stage transmission gear box 7 are fixed on the base through the fixed supports. As shown in FIG. 1, the electric drive assembly 10 comprises a frequency conversion controller 11, a drive motor 12 driven and controlled by the frequency conversion controller 11, a speed reducer 13 and a differential 14, the differential 14 comprises a front power output end 141 and a rear power output end 142. Figure 2As shown, the moving slide rail includes a guide rail 12 and a moving platform 11 moving forward and backward along the guide rail 12, and the primary transmission gear box 5 is fixed on the moving platform 11 by a fixed support, and the guide rail 12 is fixed on the base. The primary transmission gear box 5 is fixed on the moving platform 11 which can move forward and backward, and the forward and backward movement of the moving platform 11 on the guide rail 12 ensures the installation space of the electric drive assembly 10 to adapt to the space installation demand of different size samples, and facilitates the installation operation of the test; when the sample machine is fixed, the moving platform 11 will also be fixed and cannot move. The two electric drive assemblies 10 are respectively arranged between the first shaft of the primary transmission gear box 5 and the first shaft of the two-stage transmission gear box 7, and are respectively connected with the two gear boxes arranged on the two sides through the shaft couplings 8, for transmitting the rotation speed and torque between the two output shafts. The bidirectional direct current power supply 1 is electrically connected with the electric drive assembly 10 and the dynamometer 6 and supplies power for them. The cooling control system 2 is respectively connected with the two ends of the electric drive assembly 10 and the cooling interface of the gear box through water pipes, for controlling the temperature and flow of the cooling liquid of the electric drive assembly 10 and the gear box. The electric drive assembly 10, the primary transmission gear box 5, the two-stage transmission gear box 7, the dynamometer 6 and the two-stage transmission gear box 7, and the primary transmission gear box 5 and the two-stage transmission gear box 7 are connected through the shaft couplings 8, for transmitting the torque and rotation speed. The upper computer control cabinet 3 is connected with the electric drive assemblies 10 on the two test stations through CAN bus, for sending and receiving control signals. In the test process, the upper computer control cabinet 3 outputs torque signals and rotation speed signals to the electric drive assembly 10 and the dynamometer 6, for controlling the operation state of the electric drive assembly 10 and the dynamometer 6, and realizing the switching of the electric drive assembly 10 in the electric mode and the feeding mode. The rotation speed / torque measuring device 9 is connected with the data acquisition system 4 through Ethernet, and is arranged on the shaft couplings 8 of the power output ends of the electric drive assembly 10 and the shaft couplings 8 of the output ends of the dynamometer 6, for detecting the rotation speed and torque of the shaft couplings 8 and outputting to the data acquisition system 4. The three gear boxes are provided with oil temperature monitoring sensors and oil level control switches on one side, and are further provided with an oil cooling circulation system to prevent the oil temperature from being too high. The two-stage transmission gear box 7 is internally provided with an odd number of gear sets, to ensure that the rotation directions of the two electric drive assemblies 10 and the dynamometer 6 are consistent, and when the electric drive assembly 10 operates in the electric mode, the dynamometer 6 operates in the feeding mode. In order to facilitate the installation and steering connection of the shaft couplings 8, flanges are arranged at the two ends of the shaft couplings 8, and universal joints are arranged in the middle. The output ends of the primary transmission gear box 5 and the two-stage transmission gear box 7 adopt the flange scheme to match the flange end faces of the shaft couplings 8. As shown in Figure 3 The transmission ratio of the first shaft 5a and the second shaft 5b of the primary transmission gear box 5 is 1:1, and the transmission ratio of the first shaft 7a, the intermediate shaft 7b and the third shaft 7c of the two-stage transmission gear box 7 is 1:1:1.

[0026] When the temperature and humidity conditions in the use of the automobile need to be simulated, the environment box is arranged, two electric drive assemblies are arranged in the environment box, the gear box is arranged at the positions of the two sides outside the environment box, the environment box is left with the shaft coupling channel, the water inlet and outlet pipe channel and the high and low voltage cable inlet and outlet channel, the whole is separated up and down, and the installation operation is convenient.

[0027] In the embodiment, two measured electric drive assemblies are taken as the driving sources, the single dynamometer is taken as the accompanying measured power generation source, the two measured electric drive assemblies are simultaneously in the electric driving state, the test is realized on the high torque and high power point, the electric drive assembly can be manually set to the feeding working condition by the upper computer, the electric drive assembly works in the low torque and small power feeding state, and the working mode under the whole vehicle state is better simulated.

[0028] In the embodiment, the sum of the output torques of the measured electric drive assemblies is calculated, the working capacity required by the dynamometer is evaluated, the appropriate dynamometer is selected, and the "fly car" problem under the peak torque working condition point is avoided.

[0029] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of changes or replacements in the technical range disclosed in the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A new energy vehicle dual electric drive assembly towing test system, characterized in that, The application relates to an electric drive assembly test bench system, which comprises an assembly bench system and an upper computer control and acquisition system, wherein the assembly bench system comprises a dynamometer, a gear box and a shaft coupling, the gear box comprises two first-stage transmission gear boxes and one two-stage transmission gear box, the electric drive assemblies are respectively connected with the first-stage transmission gear boxes and the two-stage transmission gear box through the shaft coupling, the transmission ratio of the first shaft, the intermediate shaft and the third shaft of the two-stage transmission gear box is 1:1:1, and the two-stage transmission gear box is internally provided with an odd number of gear sets; two electric drive assemblies are respectively arranged between the first shaft of the first-stage transmission gear box and the first shaft of the two-stage transmission gear box, and are respectively connected with the two gear boxes arranged on the two sides through the shaft coupling; the output ends of the two first-stage transmission gear boxes are respectively connected with the intermediate shaft through the shaft coupling, the intermediate shaft is provided with a connecting flange on the left and right sides, the dynamometer is connected with the two-stage transmission gear box through the shaft coupling, and the two-stage transmission gear box is connected with the first-stage transmission gear box through the shaft coupling; the dynamometer is connected with the third shaft of the two-stage gear box through the shaft coupling, the two electric drive assemblies are taken as driving sources, the single dynamometer is taken as an accompanying power generation source, and the two electric drive assemblies are simultaneously in the electric driving state.

2. The new energy vehicle dual electric drive assembly towing test system according to claim 1, characterized in that, The upper computer control and acquisition system comprises an upper computer control cabinet and a data acquisition system, and the upper computer control cabinet is connected with the electric drive assemblies and the dynamometer through a CAN bus.

3. The new energy vehicle dual electric drive assembly towing test system according to claim 2, characterized in that, The assembly bench system further comprises a rotating speed / rotating torque measuring device, and the rotating speed / rotating torque measuring device is connected with the data acquisition system through an Ethernet.

4. The new energy vehicle dual electric drive assembly towing test system according to claim 3, characterized in that, The rotating speed / rotating torque measuring device is arranged on the shaft coupling of the power output end of the electric drive assembly and the shaft coupling of the output end of the dynamometer.

5. The new energy vehicle dual electric drive assembly towing test system according to claim 1, wherein, The electric drive assembly test bench system further comprises a bidirectional direct-current power supply and a cooling control system, the bidirectional direct-current power supply is electrically connected with the electric drive assemblies and the dynamometer, and the cooling control system is connected with the two power output ends of the electric drive assemblies and the cooling interfaces of the gear boxes through water pipes.

6. The new energy vehicle dual electric drive assembly towing test system according to claim 1, characterized in that, The electric drive assembly, the dynamometer and the two-stage transmission gear box are fixed on a base through fixing supports.

7. The new energy vehicle dual electric drive assembly towing test system according to claim 1 or 6, characterized in that, The electric drive assembly test bench system further comprises a moving slide rail, the moving slide rail comprises a guide rail and a moving platform which moves forward and backward along the guide rail, the first-stage transmission gear box is fixed on the moving platform through a fixing support, and the guide rail is fixed on the base.

8. The new energy vehicle dual electric drive assembly towing test system according to claim 1, characterized in that, A universal joint is arranged in the middle of the shaft coupling.

9. The new energy vehicle dual electric drive assembly towing test system according to claim 1, characterized in that, The transmission ratio of the first shaft and the second shaft of the first-stage transmission gear box is 1:1.

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