A power split planetary array test system and method

Abstract

The application discloses a kind of power split planetary gear test system and test method, the test system includes: for the first test motor of the power source to the sun gear of the measured power split planetary gear input, for the second test motor of the power source to the planet carrier input, for the third test motor of the power source to the ring gear input, for the first torque sensor of the physical parameter of the sun gear monitoring, for the second torque sensor of the physical parameter of the planet carrier monitoring, and for the third torque sensor of the physical parameter of the ring gear monitoring.The power split planetary gear test system and test method of the application provide a strong test matching system for the development of hybrid transmission, can solve the use of different characteristic parameters power planetary gear design, engine, generator parameter design, matching design, facilitate designer to better verify theoretical design parameter, and can shorten development cycle, so that the matching of engine, generator is more perfect.

Description

Technical Field

[0001] This invention relates to the field of vehicle engine testing technology, and more specifically, to a power split planetary gear set testing system and testing method. Background Technology

[0002] Planetary gear mechanisms are widely used in automatic transmissions (AT). With the development of electrification, due to their unique characteristics of being able to synthesize and decompose motion, coupled with the coaxiality of the input and output shafts, they are characterized by small size, light weight, compact structure, high load-bearing capacity, high transmission efficiency, large transmission ratio, smooth motion, and strong resistance to shock and vibration. Therefore, they have been widely used in hybrid and pure electric fields, especially in hybrid power, where they can be considered a powerful tool for power-split hybrid systems.

[0003] The development of planetary gear mechanisms in China started relatively late, initially focusing on domestically produced automatic transmissions (AT transmissions). With the trend towards vehicle electrification, planetary gear mechanisms are gradually being applied in electric drive systems, though they are still in their early stages. Currently, there is no system or method for individual testing of power-split planetary gear sets. Most domestic power-split planetary gear sets are based on Toyota's characteristic parameters of 2.6 and 2.294. Power-split planetary gear sets with other characteristic parameters are less common, and testing is usually conducted within the entire hybrid transmission system. This makes it impossible to study individual power-split planetary gear sets, particularly their efficiency, NVH (noise, vibration, and harshness), and the engine and generator performance and technical parameters required for different power-split planetary gear sets.

[0004] Therefore, there is an urgent need for a power shunt planetary chart testing system and testing method. Summary of the Invention

[0005] The purpose of this invention is to provide a power split planetary gearbox testing system and testing method to solve the problems in the prior art and provide a powerful testing and matching system for the development of hybrid transmissions.

[0006] This invention provides a power shunt planetary gear set testing system, comprising: a first test motor for inputting a power source to the sun gear of the power shunt planetary gear set under test; a second test motor for inputting a power source to the planet carrier of the power shunt planetary gear set under test; a third test motor for inputting a power source to the ring gear of the power shunt planetary gear set under test; a first torque sensor for monitoring the physical parameters of the sun gear of the power shunt planetary gear set under test; a second torque sensor for monitoring the physical parameters of the planet carrier of the power shunt planetary gear set under test; and a third torque sensor for monitoring the physical parameters of the ring gear of the power shunt planetary gear set under test.

[0007] In the power split planetary gear test system described above, preferably, the first torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the sun gear of the power split planetary gear under test; the second torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the planet carrier of the power split planetary gear under test; and the third torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the ring gear of the power split planetary gear under test.

[0008] The power shunt planetary gear test system described above preferably includes a three-motor controller connected to the first test motor, the second test motor, and the third test motor, for controlling the operating states of the first test motor, the second test motor, and the third test motor.

[0009] In the power shunt planetary array test system described above, preferably, during the test, the power shunt planetary array under test is placed inside a soundproof box, and the soundproof box is also equipped with multiple test microphones.

[0010] The present invention also provides a power shunt planetary array testing method using the above-described testing system, comprising the following steps:

[0011] With different components fixed, the efficiency of individual planetary array units with different paths was tested;

[0012] Test the efficiency of the planetary array during power shunting;

[0013] With different components fixed, the NVH of individual planetary array units with different paths were tested;

[0014] NVH of the planetary gear set during power shunt testing;

[0015] Simulations were conducted to verify the matching engine and generator parameters required for different planetary gear set characteristic parameters.

[0016] The effects of different planetary array characteristic parameters on efficiency and NVH were tested.

[0017] The power shunt planetary array test method described above, preferably, includes testing the efficiency of individual planetary array units in different paths while fixing different components, comprising:

[0018] Fixed sun gear, planetary carrier input, ring gear output: lock the first test motor, input torque to the second test motor, control the speed of the third test motor, read the torque and speed of the second torque sensor and the third torque sensor, and calculate the transmission efficiency;

[0019] Fixed sun gear, ring gear input, planetary carrier output: lock the first test motor, input torque to the third test motor, control the speed of the second test motor, read the torque and speed of the second torque sensor and the third torque sensor, and calculate the transmission efficiency;

[0020] Fixed gear ring, sun gear input, planetary carrier output: lock the third test motor, input torque to the first test motor, control the speed of the second test motor, read the torque and speed of the first torque sensor and the second torque sensor, and calculate the transmission efficiency;

[0021] Fixed gear ring, planetary carrier input, sun gear output: lock the third test motor, input torque to the second test motor, control the speed of the first test motor, read the torque and speed of the second torque sensor and the first torque sensor, and calculate the transmission efficiency;

[0022] Fixed planetary carrier, sun gear input, ring gear output: lock the second test motor, input torque to the first test motor, control the speed of the third test motor, read the torque and speed of the first torque sensor and the third torque sensor, and calculate the transmission efficiency;

[0023] Fixed planetary carrier, ring gear input, sun gear output: lock the second test motor, input torque to the third test motor, control the speed of the first test motor, read the torque and speed of the third torque sensor and the first torque sensor, and calculate the transmission efficiency.

[0024] In the power shunting planetary array test method described above, preferably, the efficiency of the planetary array during power shunting includes:

[0025] The input torque of the first test motor, the control torque of the second and third test motors, the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor are read, and the transmission efficiency is calculated.

[0026] By inputting different operating conditions, a power shunt efficiency MAP diagram is obtained.

[0027] The power shunt planetary array test method described above, preferably, includes testing the NVH of individual planetary array units with different paths while fixing different components, comprising:

[0028] The power shunt planetary array under test is placed in a silencer box, and a test microphone is arranged inside the silencer box. Following the steps described for testing the efficiency of individual planetary array units with different paths, the NVH of individual planetary array units with different fixed components are tested respectively.

[0029] The power shunt planetary array test method described above, preferably, includes the following: The test of the planetary array's NVH during power shunt includes:

[0030] The planetary array under test is placed in a silencing box, and a test microphone is arranged inside the silencing box. Following the steps described for testing the efficiency of the planetary array during power shunting, the NVH of individual planetary array units under different power shunting conditions is tested.

[0031] The power shunt planetary gear set test method described above, preferably, includes simulating and verifying the engine and generator parameters that need to be matched for different planetary gear set characteristic parameters, including:

[0032] Design planetary gearboxes with different characteristic parameters, test the input torque of the first test motor, the control torque of the second and third test motors, read the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor, and calculate the transmission efficiency;

[0033] Input different operating conditions to obtain a power shunt efficiency MAP.

[0034] The test examines the impact of different planetary array characteristic parameters on efficiency and NVH, including:

[0035] Design planetary gear sets with different characteristic parameters. Test the input torque of the first test motor, the control torque of the second test motor and the third test motor. Read the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor, and compare the efficiency and NVH of the planetary gear sets with different characteristic parameters.

[0036] This invention provides a power-split planetary gearbox testing system and method, which can be effectively used to study power-split planetary gearboxes. It offers a powerful testing and matching system for the development of hybrid transmissions, addressing the design of power planetary gearboxes with different characteristic parameters, engine and generator parameter design, and matching design. This allows hybrid systems to better utilize power-split planetary gearboxes, facilitating designers' verification of theoretical design parameters and shortening development cycles, resulting in more perfect engine and generator matching. This invention can perform the following tests: efficiency of individual planetary gearbox units with different paths (with different components fixed), efficiency of the planetary gearbox during power splitting, NVH of individual planetary gearbox units with different paths (with different components fixed), NVH of the planetary gearbox during power splitting, simulation verification of engine and generator parameters matching different planetary gearbox characteristic parameters, and the impact of different planetary gearbox characteristic parameters on efficiency and NVH. It enables better research on the efficiency and NVH of individual planetary gearbox units, especially power-split planetary gearbox units, under different transmission paths, and how planetary gearboxes with different characteristic parameters can be matched with engine and generator parameters, through theoretical analysis and practical testing. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is a schematic diagram of an embodiment of the power shunt planetary gear test system provided by the present invention;

[0039] Figure 2 A flowchart illustrating an embodiment of the power shunt planetary array testing method provided by the present invention.

[0040] Explanation of reference numerals in the attached diagram: 1-First test motor; 2-Second test motor; 3-Reversing gear pair; 4-Power shunt planetary gear set under test; 5-Second torque sensor; 6-First torque sensor; 7-Third torque sensor; 8-Third test motor; 9-Three-motor controller; 10-Test microphone. Detailed Implementation

[0041] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0042] The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as “including” or “contains” mean that the element preceding the term encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as “above” and “below” are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0043] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0044] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0045] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0046] Currently, there is no dedicated testing system for individual planetary gear sets. Tests are conducted within hybrid transmissions or gearboxes to study and test overall machine efficiency and performance. The drawbacks are: the initial design of the planetary gear set and the determination of its characteristic parameters can only be achieved through theoretical simulations or benchmarking, which easily leads to significant discrepancies between theoretical design and reality. Furthermore, it is impossible to study the actual power distribution efficiency map of the motor and engine using individual planetary gear sets, nor can it study the designed power distribution planetary gear set unit at the initial design stage; simultaneously, it is impossible to conduct testing and research on individual power distribution planetary gear sets.

[0047] like Figure 1 As shown, the power shunt planetary gear test system provided in this embodiment includes: a first test motor 1 for inputting a power source to the sun gear of the power shunt planetary gear 4 under test; a second test motor 2 for inputting a power source to the planet carrier of the power shunt planetary gear 4 under test; a third test motor 8 for inputting a power source to the ring gear of the power shunt planetary gear 4 under test; a first torque sensor 6 for monitoring the physical parameters of the sun gear of the power shunt planetary gear 4 under test; a second torque sensor 5 for monitoring the physical parameters of the planet carrier of the power shunt planetary gear 4 under test; and a third torque sensor 7 for monitoring the physical parameters of the ring gear of the power shunt planetary gear 4 under test.

[0048] The first torque sensor 6 is used to monitor at least one of the input torque, output torque and rotational speed of the sun gear of the power-splitting planetary set 4 under test; the second torque sensor 5 is used to monitor at least one of the input torque, output torque and rotational speed of the planet carrier of the power-splitting planetary set 4 under test; and the third torque sensor 7 is used to monitor at least one of the input torque, output torque and rotational speed of the ring gear of the power-splitting planetary set 4 under test.

[0049] Furthermore, the power shunt planetary gearbox testing system also includes a three-motor controller 9 connected to the first test motor 1, the second test motor 2, and the third test motor 8, used to control the operating states of the first test motor 1, the second test motor 2, and the third test motor 8. Through the three-motor controller 9, the first test motor 1, the second test motor 2, and the third test motor 8 can be linked for control, realizing the input / output torque and speed control of the three power sources of the power shunt planetary gearbox 4 under test.

[0050] Furthermore, a reversing gear pair 3 is provided on the front drive shaft of the measured power shunt planetary gear set 4. Through the action of the reversing gear pair 3, the input shaft and the output shaft rotate in the same direction.

[0051] Furthermore, during the test, the power shunt planetary array 4 under test is placed inside a silencer box, which is also equipped with multiple test microphones 10.

[0052] like Figure 2 As shown, the power shunt planetary gear set test system and test method provided in this embodiment specifically include the following steps in actual execution:

[0053] Step S1: With different components fixed, test the efficiency of planetary array units with different paths.

[0054] In one embodiment of the power shunt planetary gear test system and test method of the present invention, step S1 may specifically include:

[0055] Step S11: Fix the sun gear, input the planet carrier, and output the gear ring.

[0056] Specifically, the first test motor 1 is locked, the second test motor 2 inputs torque, the third test motor 8 controls the speed, the torque and speed of the second torque sensor 5 and the third torque sensor 7 are read, and the transmission efficiency is calculated.

[0057] Step S12: Fix the sun gear, input the gear ring, and output the planet carrier.

[0058] Specifically, the first test motor 1 is locked, the third test motor 8 inputs torque, the second test motor 2 controls the speed, the torque and speed of the second torque sensor 5 and the third torque sensor 7 are read, and the transmission efficiency is calculated.

[0059] Step S13: Fix the gear ring, input the sun gear, and output the planet carrier.

[0060] Specifically, the third test motor 8 is locked, the first test motor 1 is input with torque, the second test motor 2 controls the speed, the torque and speed of the first torque sensor 6 and the second torque sensor 5 are read, and the transmission efficiency is calculated.

[0061] Step S14: Fix the gear ring, input the planet carrier, and output the sun gear.

[0062] Specifically, the third test motor 8 is locked, the second test motor 2 inputs torque, the first test motor 1 controls the speed, the torque and speed of the second torque sensor 5 and the first torque sensor 6 are read, and the transmission efficiency is calculated.

[0063] Step S15: Fix the planet carrier, input the sun gear, and output the gear ring.

[0064] Specifically, the second test motor 2 is locked, the first test motor 1 inputs torque, the third test motor 8 controls the speed, the torque and speed of the first torque sensor 6 and the third torque sensor 7 are read, and the transmission efficiency is calculated.

[0065] Step S16: Fix the planet carrier, input the gear ring, and output the sun gear.

[0066] Specifically, the second test motor 2 is locked, the third test motor 8 inputs torque, the first test motor 1 controls the speed, the torque and speed of the third torque sensor 7 and the first torque sensor 6 are read, and the transmission efficiency is calculated.

[0067] Step S2: Test the efficiency of the planetary array during power shunting.

[0068] In one embodiment of the power shunt planetary gear test system and test method of the present invention, step S2 may specifically include:

[0069] Step S21: Input torque to the first test motor 1, control torque to the second test motor 2 and the third test motor 8, read the torque and speed of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7, and calculate the transmission efficiency.

[0070] Step S22: Input different operating conditions to obtain a power shunt efficiency MAP diagram, which is used for the design and matching of the vehicle engine and generator.

[0071] Step S3: With different components fixed, test the NVH of planetary array units with different paths.

[0072] Specifically, the power shunt planetary gear set 4 to be tested is placed in a muffler box, and a test microphone 10 is arranged inside the muffler box. Following the steps described for testing the efficiency of planetary gear set units with different paths, the NVH of planetary gear set units with different fixed components is tested respectively, in order to guide the design of the planetary gear set and the order frequencies and resonance points that should be paid attention to when matching the whole vehicle.

[0073] Step S4: Test the NVH of the planetary array during power shunt.

[0074] Specifically, the power shunt planetary gear set 4 to be tested is placed in a muffler box, and a test microphone 10 is arranged inside the muffler box. Following the steps described for testing the efficiency of the planetary gear set during power shunt, the NVH of the individual planetary gear set units under different operating conditions is tested to guide the design of the planetary gear set and the order frequencies and resonance points that should be paid attention to when matching the whole vehicle.

[0075] Step S5: Simulate and verify the engine and generator parameters that need to be matched for different planetary gear set characteristic parameters.

[0076] In one embodiment of the power shunt planetary gear test system and test method of the present invention, step S5 may specifically include:

[0077] Step S51: Design planetary gear sets with different characteristic parameters. The first test motor 1 inputs torque, and the second test motor 2 and the third test motor 8 control torque. Read the torque and speed of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7, and calculate the transmission efficiency.

[0078] Step S52: Input different operating conditions to obtain the power shunt efficiency MAP diagram, which is used for the design and matching of the vehicle engine and generator.

[0079] Step S6: Test the impact of different planetary array characteristic parameters on efficiency and NVH.

[0080] Specifically, planetary gear sets with different characteristic parameters are designed. The first test motor 1 inputs torque, and the second test motor 2 and the third test motor 8 control torque. The torque and speed of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7 are read, and the efficiency and NVH of planetary gear sets with different characteristic parameters are compared.

[0081] Furthermore, in some embodiments of the present invention, in step S6, the effects of different planetary gear set design parameters such as module, number of teeth, pressure angle, helix angle and tooth width on efficiency and NVH can also be studied.

[0082] The power-split planetary gearbox testing system and method provided in this invention can be effectively used to study power-split planetary gearboxes, providing a powerful testing and matching system for the development of hybrid transmissions. It can address the design of power planetary gearboxes with different characteristic parameters, engine and generator parameter design, and matching design, enabling hybrid systems to better utilize power-split planetary gearboxes. This facilitates designers and developers in verifying theoretical design parameters, shortens the development cycle, and achieves more perfect matching between the engine and generator. This invention can perform the following tests: efficiency of individual planetary gearbox units with different paths (with different components fixed), efficiency of the planetary gearbox during power splitting, NVH of individual planetary gearbox units with different paths (with different components fixed), NVH of the planetary gearbox during power splitting, simulation verification of engine and generator parameters that need to be matched with different planetary gearbox characteristic parameters, and the impact of different planetary gearbox characteristic parameters on efficiency and NVH. It can better study the efficiency and NVH of individual planetary gearbox units, especially power-split planetary gearbox units, under different transmission paths, and how planetary gearboxes with different characteristic parameters can be matched with engine and generator parameters, through theoretical analysis and practical testing.

[0083] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0084] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A power shunt planetary chart test system, characterized in that, include: A first test motor for inputting power to the sun gear of the power shunt planetary set under test, a second test motor for inputting power to the planet carrier of the power shunt planetary set under test, a third test motor for inputting power to the ring gear of the power shunt planetary set under test, a first torque sensor for monitoring the physical parameters of the sun gear of the power shunt planetary set under test, a second torque sensor for monitoring the physical parameters of the planet carrier of the power shunt planetary set under test, and a third torque sensor for monitoring the physical parameters of the ring gear of the power shunt planetary set under test.

2. The power shunt planetary gear setter test system according to claim 1, characterized in that, The first torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the sun gear of the power-splitting planetary set under test; the second torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the planet carrier of the power-splitting planetary set under test; and the third torque sensor is used to monitor at least one of the input torque, output torque, and rotational speed of the ring gear of the power-splitting planetary set under test.

3. The power shunt planetary gear setter test system according to claim 1, characterized in that, The power shunt planetary gear test system also includes a three-motor controller connected to the first test motor, the second test motor and the third test motor, for controlling the working status of the first test motor, the second test motor and the third test motor.

4. The power shunt planetary gear setter test system according to claim 1, characterized in that, During the test, the power shunt planetary array under test is placed inside a silencer box, which is also equipped with multiple test microphones.

5. A method for testing a power shunt planetary array using the test system described in any one of claims 1-4, characterized in that, include: With different components fixed, the efficiency of individual planetary array units with different paths was tested; Test the efficiency of the planetary array during power shunting; With different components fixed, the NVH of individual planetary array units with different paths were tested; NVH of the planetary gear set during power shunt testing; Simulations were conducted to verify the matching engine and generator parameters required for different planetary gear set characteristic parameters. The effects of different planetary array characteristic parameters on efficiency and NVH were tested.

6. The power shunt planetary array test method according to claim 5, characterized in that, The method of testing the efficiency of individual planetary array units with different paths while fixing different components includes: Fixed sun gear, planetary carrier input, ring gear output: lock the first test motor, input torque to the second test motor, control the speed of the third test motor, read the torque and speed of the second torque sensor and the third torque sensor, and calculate the transmission efficiency; Fixed sun gear, ring gear input, planetary carrier output: lock the first test motor, input torque to the third test motor, control the speed of the second test motor, read the torque and speed of the second torque sensor and the third torque sensor, and calculate the transmission efficiency; Fixed gear ring, sun gear input, planetary carrier output: lock the third test motor, input torque to the first test motor, control the speed of the second test motor, read the torque and speed of the first torque sensor and the second torque sensor, and calculate the transmission efficiency; Fixed gear ring, planetary carrier input, sun gear output: lock the third test motor, input torque to the second test motor, control the speed of the first test motor, read the torque and speed of the second torque sensor and the first torque sensor, and calculate the transmission efficiency; Fixed planetary carrier, sun gear input, ring gear output: lock the second test motor, input torque to the first test motor, control the speed of the third test motor, read the torque and speed of the first torque sensor and the third torque sensor, and calculate the transmission efficiency; Fixed planetary carrier, ring gear input, sun gear output: lock the second test motor, input torque to the third test motor, control the speed of the first test motor, read the torque and speed of the third torque sensor and the first torque sensor, and calculate the transmission efficiency.

7. The power shunt planetary array test method according to claim 5, characterized in that, The efficiency of the planetary array during the test power shunting includes: The input torque of the first test motor, the control torque of the second and third test motors, the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor are read, and the transmission efficiency is calculated. By inputting different operating conditions, a power shunt efficiency MAP diagram is obtained.

8. The power shunt planetary array test method according to claim 5, characterized in that, The method of testing the NVH of individual planetary array units with different paths while fixing different components includes: The power shunt planetary array under test is placed in a silencer box, and a test microphone is arranged inside the silencer box. Following the steps described for testing the efficiency of individual planetary array units with different paths, the NVH of individual planetary array units with different fixed components are tested respectively.

9. The power shunt planetary array test method according to claim 5, characterized in that, The NVH of the planetary array during power shunting includes: The planetary array under test is placed in a silencing box, and a test microphone is arranged inside the silencing box. Following the steps described for testing the efficiency of the planetary array during power shunting, the NVH of individual planetary array units under different power shunting conditions is tested.

10. The power shunt planetary array test method according to claim 5, characterized in that, The simulation verification of engine and generator parameters that need to be matched for different planetary gear characteristic parameters includes: Design planetary gearboxes with different characteristic parameters, test the input torque of the first test motor, the control torque of the second and third test motors, read the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor, and calculate the transmission efficiency; Input different operating conditions to obtain a power shunt efficiency MAP. The test examines the impact of different planetary array characteristic parameters on efficiency and NVH, including: Design planetary gear sets with different characteristic parameters. Test the input torque of the first test motor, the control torque of the second test motor and the third test motor. Read the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor, and compare the efficiency and NVH of the planetary gear sets with different characteristic parameters.

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