Three-axis electric drive system EMC (Electro Magnetic Compatibility) test bench and test method

Abstract

The invention provides a three-axis electric drive system EMC test bench and a test method. The three-axis electric drive system EMC test bench is characterized in that a tested electric drive system is installed on a third base; the first dynamometer and the second dynamometer are installed on the first base. The third dynamometer is mounted on the second base; the first base and the second base are arranged on the two sides of the third base respectively. Shielding devices are arranged between the third rack and the first rack and between the third rack and the second rack respectively. The first connecting shaft is connected between the first dynamometer and the electric drive system; the second connecting shaft is connected between the second dynamometer and the electric drive system through the gearbox, and the first connecting shaft and the second connecting shaft are arranged in parallel; the third connecting shaft is connected between the electric drive system and the third dynamometer. And the first connecting shaft, the second connecting shaft and the third connecting shaft respectively penetrate through the shielding device. The three-axis loading device has the effects that the three-axis loading working condition requirement of the hybrid power driving system is met, the hybrid power vehicle type is covered, and the working condition of the hybrid power vehicle type can be simulated more truly.

Description

Technical Field

[0001] This invention belongs to the field of EMC testing technology, specifically, it relates to an EMC test bench and testing method for a three-axis electric drive system. Background Technology

[0002] With the booming development of new energy vehicles, various technologies have been significantly improved and innovated, resulting in a wealth of technological accumulation. Especially in the drive systems of new energy vehicles, the early drive systems, composed of relatively independent control and functional units, have gradually evolved into multi-functional powertrain systems. Moreover, the integration level of these systems is increasing, for example, from three-in-one to five-in-one or even seven-in-one systems. This technological upgrade trend is unstoppable and has left other countries far behind. From the outside, higher integration makes them appear simpler, but the internal structure of the powertrain actually becomes more complex. Currently, there are two main drive systems on the market: pure electric drive and hybrid drive. Due to range anxiety associated with pure electric vehicles, hybrid products have emerged that address both aspects. For hybrid drive systems, in addition to driving the vehicle wheels, the drive output shaft of the powertrain also has an additional generator drive shaft compared to pure electric systems.

[0003] In early electric vehicle designs, the motor output had only one separate shaft, distributed to the two drive shafts via a differential. Later, three-in-one motors integrated the reducer and differential, resulting in a symmetrical design with two shafts on the left and right sides – the current mainstream drive design for pure electric vehicles. For hybrid vehicles, considering generator generation or parallel / series drive methods, an additional generator shaft is added, resulting in a three-shaft configuration. Early EMC load tests typically only required loading one shaft, making the load system relatively simple. For two-shaft EMC testing of pure electric vehicles, both shafts usually need to be loaded simultaneously. For the generator shaft, power needs to be supplied to simulate generator operation, ensuring it conforms to actual EMC testing conditions.

[0004] Patent document CN116609087A discloses an offline test bench for an electric drive assembly, relating to the field of new energy vehicle technology. The device includes a bench base, an NHV bracket, a robotic arm, and a PLC control unit. The NHV bracket is mounted on the bench base, and the PLC control unit and the robotic arm are mounted on the NHV bracket. The robotic arm is located above the test position and is connected to an NHV test unit and a positioning sensor. The positioning sensor is used to collect the position information of the NHV test unit and the electric drive assembly. Both the positioning sensor and the robotic arm are connected to the PLC control unit for signal transmission, thereby performing electric drive assembly testing.

[0005] However, patent document CN116609087A cannot handle the situation of simultaneous loading of three axles in hybrid vehicles, and cannot match the actual working conditions of vehicles. This makes the towing and loading system more complicated and the cost increases accordingly.

[0006] To meet the requirements of three-axis loading conditions for hybrid drive systems, cover hybrid vehicle models, and more realistically simulate the operating conditions of hybrid vehicles, resulting in EMC test results that are closer to actual conditions, this invention designs a three-axis electric drive system EMC test bench and testing method, solving the aforementioned problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an EMC test bench and testing method for a three-axis electric drive system.

[0008] According to the present invention, a triaxial electric drive system EMC test bench includes: a first bench, a second bench, and a third bench; The third frame includes a third base, an electric drive system, a first connecting shaft, a second connecting shaft, and a third connecting shaft; The electric drive system is installed on the third base; The first frame includes a first base, a first dynamometer, and a second dynamometer; The first dynamometer and the second dynamometer are mounted on the first base; The second frame includes a second base and a third dynamometer; The third dynamometer is installed on the second base; The first base and the second base are respectively located on both sides of the third base, and shielding devices are respectively provided between the third frame and the first frame and the second frame; The first connecting shaft is connected between the first dynamometer and the electric drive system; the second connecting shaft is connected between the second dynamometer and the electric drive system by a gearbox, and the first connecting shaft and the second connecting shaft are arranged side by side; The third connecting shaft connects the electric drive system and the third dynamometer. The first connecting shaft, the second connecting shaft, and the third connecting shaft each pass through the shielding device; The electric drive system can be insulated from the first connecting shaft, the second connecting shaft, the third connecting shaft, and the shielding device.

[0009] Preferably, the first frame further includes a first gearbox, with one input end of the first gearbox connected to a first dynamometer and a second dynamometer, and one output end of the first gearbox connected to a first connecting shaft and a second connecting shaft.

[0010] Preferably, the axes of the input end and the corresponding output end of the first gearbox can be misaligned, and gear transmission is performed between the input end and the output end of the first gearbox that are axially misaligned. The first dynamometer and the second dynamometer are arranged side by side along the axis of the input shaft of the first gearbox.

[0011] Preferably, the third frame is equipped with a second gearbox, the input end of the second gearbox is respectively connected to the first connecting shaft and the second connecting shaft, the second gearbox has an output end corresponding to the input end of the first connecting shaft, the second gearbox has two output ends corresponding to the input end of the second connecting shaft, and the output ends corresponding to the second connecting shaft are respectively located on both sides of the output end of the second gearbox corresponding to the first connecting shaft, and the output ends on both sides corresponding to the second connecting shaft can respectively drive the input end of the second gearbox corresponding to the second connecting shaft to rotate.

[0012] Preferably, the shielding device includes a first anechoic chamber, a second anechoic chamber, and a dark chamber; The first frame, the second frame, and the third frame were installed in the first anechoic chamber, the second anechoic chamber, and the dark chamber, respectively.

[0013] Preferably, the first connecting shaft, the second connecting shaft, and the third connecting shaft are rotatably connected to the bearing unit mounted on the third base.

[0014] Preferably, the bottom of the first frame, the second frame and the third frame are respectively provided with insulating pads.

[0015] Preferably, a coupling extends between the third dynamometer and the third connecting shaft, and the coupling is rotatably connected to a bearing unit mounted on the second base.

[0016] Preferably, the electric drive system can be insulated and fixedly connected to the first connecting shaft, the second connecting shaft, and the third connecting shaft by an insulating flange shaft.

[0017] According to the present invention, a three-axis electric drive system EMC testing method is provided, using the aforementioned three-axis electric drive system EMC test bench, the steps of which include: Step S1: The electric drive system transmits power to the first connecting shaft, the second connecting shaft and the third connecting shaft respectively. The first connecting shaft and the second connecting shaft are adapted to the change in the shaft distance between the first dynamometer and the second dynamometer through the first gearbox. Step S2: The third connecting shaft is adjusted by the coupling to adapt to the change in distance with the third dynamometer; Step S3: The electric drive system is connected to the first connecting shaft, the second connecting shaft, and the third connecting shaft, and the test begins.

[0018] Compared with existing technologies, the present invention has the following advantages: Compared with the first-generation single-axis and second-generation dual-axis motor drive systems, the present invention adds an additional axis, enabling it to cover hybrid vehicle models and more realistically simulate the operating conditions of hybrid vehicles, resulting in EMC test results that are closer to actual conditions. It fills the gap in the first-generation and second-generation bench loading systems. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram illustrating the insulating flange shaft of the present invention.

[0021] Figure 3 This is a schematic diagram illustrating the insulating pad of the present invention.

[0022] The diagram shows: 1. First frame; 11. First base; 12. First dynamometer; 13. Second dynamometer; 14. First gearbox; 2. Second frame; 21. Second base; 22. Third dynamometer; 3. Third frame; 31. Third base; 32. Electric drive system; 33. First connecting shaft; 34. Second connecting shaft; 35. Third connecting shaft; 4. Shielding device; 41. First anechoic chamber; 42. Second anechoic chamber; 43. Dark chamber; 6. Bearing unit; 7. Insulating pad; 8. Coupling; 9. Insulating flange shaft. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0024] like Figures 1-3 As shown, a triaxial electric drive system EMC test bench includes a first bench 1, a second bench 2 and a third bench 3; The first frame 1 and the second frame 2 are respectively set on both sides of the third base 31, and a shielding device 4 is respectively provided between the third frame 3 and the first frame 1 and the second frame 2; The shielding device 4 includes a first anechoic chamber 41, a second anechoic chamber 42, and a dark chamber 43; The first frame 1, the second frame 2 and the third frame 3 are respectively installed in the first anechoic chamber 41, the second anechoic chamber 42 and the dark chamber 43, and the bottom of the first frame 1, the second frame 2 and the third frame 3 are respectively provided with insulating pads 7.

[0025] The third frame 3 includes a third base 31, an electric drive system 32, a first connecting shaft 33, a second connecting shaft 34, and a third connecting shaft 35; The tested electric drive system 32 is mounted on the third base 31; The first connecting shaft 33 and the second connecting shaft 34 can be insulated and fixedly connected to the electric drive system 32 on the same side by the insulating flange shaft 9, and the first connecting shaft 33 and the second connecting shaft 34 pass through the first anechoic chamber 41 and the second anechoic chamber 42 for connection. The third connecting shaft 35 can be insulatedly and fixedly connected to the electric drive system 32 by the insulating flange shaft 9 in the direction relative to the first connecting shaft 33, thereby disconnecting the electrical circuit of the electric drive system 32. Furthermore, the first connecting shaft 33, the second connecting shaft 34, and the third connecting shaft 35 are rotatably connected to the bearing unit 6 installed on the third base 31 to ensure rotational stability; The first frame 1 includes a first gearbox 14, a first base 11, a first dynamometer 12, and a second dynamometer 13; The first dynamometer 12 and the second dynamometer 13 are mounted on the first base 11; The second frame 2 includes a second base 21 and a third dynamometer 22; Because the shaft spacing between the first dynamometer 12 and the second dynamometer 13 is relatively large, in order to adapt to the shaft spacing of the electric drive system 32, the input end of the first gearbox 14 is connected to the first dynamometer 12 and the second dynamometer 13 respectively, and the output end of the first gearbox 14 is connected to the first connecting shaft 33 and the second connecting shaft 34 respectively. The axes of the input end and the corresponding output end of the first gearbox 14 can be misaligned. Gear transmission is performed between the axially misaligned input end and output end of the first gearbox 14. The first dynamometer 12 and the second dynamometer 13 are arranged side by side along the axis of the input shaft of the first gearbox 14.

[0026] In one variation: the third frame 3 is equipped with a second gearbox, the input end of which is respectively connected to the first connecting shaft 33 and the second connecting shaft 34. The second gearbox has an output end corresponding to the input end of the first connecting shaft 33, and two output ends corresponding to the input end of the second connecting shaft 34. The output ends corresponding to the second connecting shaft 34 are respectively located on both sides of the output end of the second gearbox corresponding to the first connecting shaft 33. The output ends on both sides of the second connecting shaft 34 can drive the input end of the second gearbox corresponding to the second connecting shaft 34 to rotate. When the drive shaft direction of the electric drive system 32 changes, the output ends on both sides of the second gearbox can be connected to the second connecting shaft 34.

[0027] The third dynamometer 22 is installed on the second base 21; A coupling 8 extends between the third dynamometer 22 and the third connecting shaft 35. The coupling 8 is rotatably connected to the bearing unit 6 installed on the second base 21, thereby adapting to electric drive units with different wheelbases. The coupling 8 passes through the second anechoic chamber 42 and the dark chamber 43 for connection, forming a test arrangement for a hybrid drive system that can adapt to a wide wheelbase range.

[0028] Therefore, the load conditions of the three axes (generator input shaft and output shafts at both ends of the drive motor) of the hybrid drive system are required.

[0029] This invention also provides an EMC testing method for a three-axis electric drive system, using a three-axis electric drive system EMC test bench, the steps of which include: Step S1: The electric drive system 32 transmits power to the first connecting shaft 33, the second connecting shaft 34 and the third connecting shaft 35 respectively. The first connecting shaft 33 and the second connecting shaft 34 are adapted to the change in the shaft spacing between the first dynamometer 12 and the second dynamometer 13 through the first gearbox 14. Step S2: The third connecting shaft 35 is adjusted by the coupling 8 to adapt to the change in distance with the third dynamometer 22; Step S3: The electric drive system 32 is connected to the first connecting shaft 33, the second connecting shaft 34 and the third connecting shaft 35, and the test begins.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An EMC test bench for a three-axis electric drive system, characterized in that, include: The first frame (1), the second frame (2), and the third frame (3); The third frame (3) includes a third base (31), an electric drive system (32), a first connecting shaft (33), a second connecting shaft (34), and a third connecting shaft (35); The electric drive system (32) is mounted on the third base (31); The first frame (1) includes a first base (11), a first dynamometer (12), and a second dynamometer (13); The first dynamometer (12) and the second dynamometer (13) are mounted on the first base (11); The second frame (2) includes a second base (21) and a third dynamometer (22); The third dynamometer (22) is installed on the second base (21); The first base (11) and the second base (21) are respectively disposed on both sides of the third base (31), and shielding devices (4) are respectively provided between the third frame (3) and the first frame (1) and the second frame (2); The first connecting shaft (33) is connected between the first dynamometer (12) and the electric drive system (32); the second connecting shaft (34) is connected between the second dynamometer (13) and the electric drive system (32) by a gearbox, and the first connecting shaft (33) and the second connecting shaft (34) are arranged side by side; The third connecting shaft (35) is connected between the electric drive system (32) and the third dynamometer (22); The first connecting shaft (33), the second connecting shaft (34) and the third connecting shaft (35) pass through the shielding device (4) respectively; The electric drive system (32) can be insulated from the first connecting shaft (33), the second connecting shaft (34), the third connecting shaft (35), and the shielding device (4).

2. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, The first frame (1) also includes a first gearbox (14), with the input end of the first gearbox (14) connected to the first dynamometer (12) and the second dynamometer (13) respectively, and the output end of the first gearbox (14) connected to the first connecting shaft (33) and the second connecting shaft (34) respectively.

3. The EMC test bench for the three-axis electric drive system according to claim 2, characterized in that, The axes of the input end and the corresponding output end of the first gearbox (14) can be misaligned. The input end and the output end of the first gearbox (14) are axially misaligned and gear transmission is performed between them. The first dynamometer (12) and the second dynamometer (13) are arranged side by side along the axis of the input shaft of the first gearbox (14).

4. The EMC test bench for the three-axis electric drive system according to claim 3, characterized in that, The third frame (3) is provided with a second gearbox. The input end of the second gearbox is respectively connected to the first connecting shaft (33) and the second connecting shaft (34). The second gearbox is provided with an output end corresponding to the input end of the first connecting shaft (33). The second gearbox is provided with two output ends corresponding to the input end of the second connecting shaft (34). The output ends corresponding to the second connecting shaft (34) are respectively located on both sides of the output end of the second gearbox corresponding to the first connecting shaft (33). The output ends on both sides corresponding to the second connecting shaft (34) can drive the input end of the second gearbox corresponding to the second connecting shaft (34) to rotate.

5. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, The shielding device (4) includes a first anechoic chamber (41), a second anechoic chamber (42), and a dark chamber (43); The first frame (1), the second frame (2) and the third frame (3) are respectively installed in the first anechoic chamber (41), the second anechoic chamber (42) and the dark chamber (43).

6. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, The first connecting shaft (33), the second connecting shaft (34) and the third connecting shaft (35) are rotatably connected to the bearing unit (6) mounted on the third base (31).

7. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, Insulating pads (7) are provided at the bottom of the first frame (1), the second frame (2) and the third frame (3).

8. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, A coupling (8) extends between the third dynamometer (22) and the third connecting shaft (35), and the coupling (8) is rotatably connected to the bearing unit (6) installed on the second base (21).

9. The EMC test bench for the three-axis electric drive system according to claim 1, characterized in that, The electric drive system (32) can be insulated and fixedly connected to the first connecting shaft (33), the second connecting shaft (34) and the third connecting shaft (35) by an insulating flange shaft (9).

10. A method for EMC testing of a three-axis electric drive system, using the three-axis electric drive system EMC test bench according to any one of claims 1-9, characterized in that the steps are as follows: include: Step S1: The electric drive system (32) transmits power to the first connecting shaft (33), the second connecting shaft (34) and the third connecting shaft (35) respectively. The first connecting shaft (33) and the second connecting shaft (34) are connected by the first gearbox (14) to adapt to the change in the shaft distance between the first dynamometer (12) and the second dynamometer (13). Step S2: The third connecting shaft (35) is adjusted by the coupling (8) to adapt to the change in distance with the third dynamometer (22); Step S3: The electric drive system (32) is connected to the first connecting shaft (33), the second connecting shaft (34) and the third connecting shaft (35), and the test begins.

Images