Power dividing planet row test system and test method

Abstract

The invention discloses a power dividing planet row test system and test method. The test system comprises a first test motor used for inputting a power source to a sun gear of a tested power dividing planet row, a second test motor used for inputting a power source to a planet carrier, a third test motor used for inputting a power source to a gear ring, a first torque sensor used for monitoring physical parameters of the sun gear, and a second torque sensor used for monitoring physical parameters of the gear ring. The second torque sensor is used for monitoring physical parameters of the planet carrier; and the third torque sensor is used for monitoring physical parameters of the gear ring. According to the power dividing planet row test system and test method, a powerful test matching system is provided for development of a hybrid gearbox, use of power planet rows with different characteristic parameters and parameter design and matching design of an engine and a generator can be achieved, design developers can better verify theoretical design parameters conveniently, and the test efficiency is improved. And the development period can be shortened, so that the matching of the engine and the generator is more perfect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle engine testing, and more particularly to a power split planetary gear set testing system and testing method. BACKGROUND

[0002] Planetary gear mechanisms are widely used in AT gearboxes. With the development of electrification, they have the unique characteristics of realizing the synthesis and decomposition of motion, and have the characteristics of coaxial input shaft and output shaft, small volume, small mass, compact structure, large carrying capacity, high transmission efficiency, large transmission ratio, stable motion, strong anti-impact and vibration capacity, and are widely used in hybrid and pure electric fields. In particular, in the field of hybrid power, it can be said to be a powerful weapon for power split hybrid power.

[0003] Domestic planetary gear mechanisms started relatively late. In the early stage, they were mainly used in domestic AT gearboxes. With the development trend of automobile electrification, planetary gear mechanisms have gradually begun to be applied in electric drive fields, and are basically in the initial stage. At present, there is no single testing research system and method for power split planetary gear sets. Most of the power split planetary gear sets in China are based on the characteristic parameters 2.6 and 2.294 of Toyota, and other characteristic parameters of power split planetary gear sets are rarely seen. Moreover, they are tested in the whole hybrid gearbox, and cannot be studied as a single unit, especially the efficiency, NVH, and the performance and technical parameters of the engine and generator required by different power split planetary gear sets.

[0004] Therefore, there is an urgent need for a power split planetary gear set testing system and testing method. SUMMARY

[0005] The purpose of the present application is to provide a power split planetary gear set testing system and testing method to solve the problems in the prior art and provide a powerful testing matching system for the development of hybrid gearboxes.

[0006] The present application provides a power split planetary gear set testing system, which comprises: a first test motor for inputting a power source to the sun gear of the measured power split planetary gear set, a second test motor for inputting a power source to the planet carrier of the measured power split planetary gear set, a third test motor for inputting a power source to the ring gear of the measured power split planetary gear set, a first torque sensor for monitoring the physical parameters of the sun gear of the measured power split planetary gear set, a second torque sensor for monitoring the physical parameters of the planet carrier of the measured power split planetary gear set, and a third torque sensor for monitoring the physical parameters of the ring gear of the measured power split planetary gear set.

[0007] The power split planetary gear test system as described above, wherein preferably, the first torque sensor is used to monitor at least one of the input torque, the output torque and the rotation 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, the output torque and the rotation 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, the output torque and the rotation speed of the ring gear of the power split planetary gear under test.

[0008] The power split planetary gear test system as described above, wherein preferably, the power split planetary gear test system further comprises a three-motor controller connected with the first test motor, the second test motor and the third test motor, and used to control the working states of the first test motor, the second test motor and the third test motor.

[0009] The power split planetary gear test system as described above, wherein preferably, during the test, the power split planetary gear under test is placed in a soundproof box, and a plurality of test microphones are arranged in the soundproof box.

[0010] The present application further provides a power split planetary gear test method using the test system as described above, comprising the following steps:

[0011] Testing the efficiency of different path planetary gear units with different elements fixed;

[0012] Testing the efficiency of the planetary gear during power split;

[0013] Testing the NVH of different path planetary gear units with different elements fixed;

[0014] Testing the NVH of the planetary gear during power split;

[0015] Simulating and verifying the engine and generator parameters matched with different planetary gear characteristic parameters;

[0016] Testing the effects of different planetary gear characteristic parameters on the efficiency and NVH.

[0017] The power split planetary gear test method as described above, wherein preferably, the testing the efficiency of different path planetary gear units with different elements fixed comprises:

[0018] Fixing the sun gear, inputting the planet carrier and outputting the ring gear: locking the first test motor, inputting torque of the second test motor, controlling the rotation speed of the third test motor, reading the torque and rotation speed of the second torque sensor and the third torque sensor, and calculating the transmission efficiency;

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

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

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

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

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

[0024] The power split planetary gear set test method as described above, wherein preferably, the test efficiency of the power split planetary gear set includes:

[0025] The first test motor input torque, the second test motor and the third test motor control torque, read the torque and speed of the first torque sensor, the second torque sensor and the third torque sensor, calculate the transmission efficiency;

[0026] Input different working conditions to get the power split efficiency MAP.

[0027] The power split planetary gear set test method as described above, wherein preferably, the test NVH of different path planetary gear set units under the condition of fixing different elements includes:

[0028] The measured power split planetary gear set is placed in a soundproof box, test microphones are arranged in the soundproof box, and the NVH of the planetary gear set unit with different fixed elements is tested according to the steps of testing the efficiency of the different path planetary gear set unit.

[0029] The power split planetary gear set test method as described above, wherein preferably, the test NVH of the power split planetary gear set includes:

[0030] The power split planetary gear train to be tested is arranged in a soundproof box, a test microphone is arranged in the soundproof box, and the NVH of the planetary gear train under different working conditions of power split is tested according to the steps of testing the efficiency of the planetary gear train under the power split.

[0031] The power split planetary gear train testing method as described above, preferably, the engine and generator parameters that need to be matched with different planetary gear train characteristic parameters are simulated and verified, including:

[0032] The planetary gear trains with different characteristic parameters are designed, the input torque of the first test motor, the control torque of the second test motor and the third test motor are tested, the torque and rotating speed of the first torque sensor, the second torque sensor and the third torque sensor are read, and the transmission efficiency is calculated.

[0033] The power split efficiency MAP is obtained by inputting different working conditions,

[0034] The test of the influence of different planetary gear train characteristic parameters on the efficiency and NVH includes:

[0035] The planetary gear trains with different characteristic parameters are designed, the input torque of the first test motor, the control torque of the second test motor and the third test motor are tested, the torque and rotating speed of the first torque sensor, the second torque sensor and the third torque sensor are read, and the efficiency and NVH of the planetary gear trains with different characteristic parameters are compared.

[0036] The power split planetary gear train testing system and testing method can be well used to study the power split planetary gear train, provide a powerful testing matching system for the development of the hybrid transmission, solve the use of the power planetary gear train with different characteristic parameters, the parameter design of the engine and generator, the matching design, make the hybrid system better use the power split planetary gear train, facilitate the designer to better verify the theoretical design parameters, and shorten the development cycle, make the matching of the engine and generator more perfect; the present application can complete the following test contents: the efficiency of the planetary gear train with different paths (fixed different elements), the efficiency of the planetary gear train under power split, the NVH of the planetary gear train with different paths (fixed different elements), the NVH of the planetary gear train under power split, the simulation verification of the engine and generator parameters that need to be matched with different planetary gear train characteristic parameters, the influence of different planetary gear train characteristic parameters on the efficiency and NVH; the planetary gear train, especially the power split planetary gear train, can be better studied, especially the efficiency and NVH of the different transmission paths of the power split planetary gear train, and how the planetary gear train with different characteristic parameters matches the engine and generator parameters, and how to study through theoretical analysis and actual test. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described below with reference to the drawings, in which:

[0038] Figure 1 A structural schematic diagram of an embodiment of a power split planetary gear set test system provided by the present application is shown in FIG. 1.

[0039] Figure 2 A flow chart of an embodiment of a power split planetary gear set test method provided by the present application is shown in FIG. 2.

[0040] Reference signs: 1-first test motor; 2-second test motor; 3-reversing gear pair; 4-power split planetary gear set to be tested; 5-second torque sensor; 6-first torque sensor; 7-third torque sensor; 8-third test motor; 9-three-motor controller; 10-test microphone. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative in nature and is in no way intended to limit the disclosure, its application or uses, except as described by the appended claims. The present disclosure can be implemented in numerous different forms, as is required, and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the relative arrangement of components and steps set forth in these embodiments, the components of the materials, numerical expressions, and numerical values, unless specifically stated otherwise, should be interpreted as merely exemplary, rather than as a limitation.

[0042] The terms "first", "second", and similar terms used in the present disclosure do not denote any order, number or importance, but are used to distinguish different parts. The terms "comprise", "include" or "contain" and similar terms mean that the elements before the term encompass the elements listed after the term, and do not exclude the possibility of also encompassing other elements. "Up", "down" and the like are used only to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In the present disclosure, when it is described that a specific component is located between a first component and a second component, there can be an intervening component between the specific component and the first component or the second component, or there can be no intervening component. When it is described that a specific component is connected to other components, the specific component can be directly connected to the other components without an intervening component, or can not be directly connected to the other components with an intervening component.

[0044] All terms used in the present disclosure, including technical terms or scientific terms, have the same meaning as understood by a person of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary should be interpreted in a manner consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or excessively formalized sense, unless otherwise explicitly defined herein.

[0045] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art(s) can not be discussed in any detail since the techniques, methods, and apparatus should be considered part of the specification.

[0046] At present, there is no special test system for testing single planetary gear sets, and all tests are carried out in hybrid transmission or reduction gearbox to study and test the overall efficiency and performance. The disadvantages are: the design of the planetary gear set and the determination of the characteristic parameters of the planetary gear set can only be designed by theoretical simulation calculation or reference to the benchmark, which is easy to cause large deviation between the theoretical design and the actual situation, and it is impossible to study the actual efficiency MAP of the motor and engine power split through the single planetary gear set, and it is also impossible to study the designed power split planetary gear set at the beginning of the design; at the same time, it is also impossible to test and study the single power split planetary gear set.

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

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

[0049] Further, the power split planetary gear test system further comprises a three-motor controller 9 connected with the first test motor 1, the second test motor 2 and the third test motor 8, for controlling the working state 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 controlled in linkage, so as to realize the input / output torque and rotational speed control of the three power sources of the measured power split planetary gear 4.

[0050] Further, the front drive shaft of the measured power split planetary gear 4 is provided with a reversing gear pair 3, and the input shaft and the output shaft have the same rotation direction through the action of the reversing gear pair 3.

[0051] Further, during the test, the measured power split planetary gear 4 is placed in a soundproof box, and a plurality of test microphones 10 are also arranged in the soundproof box.

[0052] As shown in the embodiment provided by the power split planetary gear test system and test method, the actual execution process specifically includes the following steps: Figure 2

[0053] Step S1, test the efficiency of different path planetary gear units under the condition of fixing different elements.

[0054] In one embodiment of the power split planetary gear test system and test method, the step S1 can specifically include:

[0055] Step S11, fix the sun gear, input the planetary carrier, and output the ring gear.

[0056] Specifically, lock the first test motor 1, input the torque of the second test motor 2, control the speed of the third test motor 8, read the torque and speed of the second torque sensor 5 and the third torque sensor 7, and calculate the transmission efficiency.

[0057] Step S12, fix the sun gear, input the ring gear, and output the planetary carrier.

[0058] Specifically, lock the first test motor 1, input the torque of the third test motor 8, control the speed of the second test motor 2, read the torque and speed of the second torque sensor 5 and the third torque sensor 7, and calculate the transmission efficiency.

[0059] Step S13, fix the ring gear, input the sun gear, and output the planetary carrier.

[0060] Specifically, lock the third test motor 8, input the torque of the first test motor 1, control the speed of the second test motor 2, read the torque and speed of the first torque sensor 6 and the second torque sensor 5, and calculate the transmission efficiency.

[0061] Step S14, fix the ring gear, input the planetary carrier, and output the sun gear.

[0062] Specifically, lock the third test motor 8, input the torque of the second test motor 2, control the speed of the first test motor 1, read the torque and speed of the second torque sensor 5 and the first torque sensor 6, and calculate the transmission efficiency.

[0063] Step S15, fix the planetary carrier, input the sun gear, and output the ring gear. ​

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

[0065] Step S16, the planet carrier is fixed, the ring gear inputs, and the sun gear outputs.

[0066] Specifically, the second test motor 2 is locked, the third test motor 8 inputs torque, the first test motor 1 controls the rotation speed, the torques and rotation speeds 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 gear set during power split.

[0068] In an embodiment of the power split planetary gear set test system and test method, the step S2 can specifically include:

[0069] Step S21, the first test motor 1 inputs torque, the second test motor 2 and the third test motor 8 control torque, the torques and rotation speeds of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7 are read, and the transmission efficiency is calculated.

[0070] Step S22, input different working conditions to obtain a power split efficiency MAP, which is used for engine and generator design matching.

[0071] Step S3, test the NVH of different path planetary gear set units under the condition of fixing different elements.

[0072] Specifically, the measured power split planetary gear set 4 is placed in an anechoic box, a test microphone 10 is arranged in the anechoic box, the efficiency of the planetary gear set unit is tested according to the step of testing the efficiency of the different path planetary gear set unit, and the NVH of the planetary gear set unit with different elements fixed is tested, so as to guide the design of the planetary gear set and the order frequency and resonance point that should be paid attention to during vehicle matching.

[0073] Step S4, test the NVH of the planetary gear set during power split.

[0074] Specifically, the measured power split planetary gear set 4 is placed in an anechoic box, a test microphone 10 is arranged in the anechoic box, the efficiency of the planetary gear set unit is tested according to the step of testing the efficiency of the different path planetary gear set unit, and the NVH of the planetary gear set unit with different elements fixed is tested, so as to guide the design of the planetary gear set and the order frequency and resonance point that should be paid attention to during vehicle matching.

[0075] Step S5, simulate and verify the engine and generator parameters that need to be matched according to different planetary gear set characteristic parameters.

[0076] In one embodiment of the power split planetary gear set test system and test method of the application, the step S5 can specifically include:

[0077] Step S51, design planetary gears with different characteristic parameters, input torque of the first test motor 1, control torque of the second test motor 2 and the third test motor 8, read torque and rotating speed of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7, and calculate transmission efficiency.

[0078] Step S52, input power split efficiency MAP graph under different working conditions, for design matching of vehicle engine and generator.

[0079] Step S6, test influence of different planetary gear set characteristic parameters on efficiency and NVH.

[0080] Specifically, design planetary gears with different characteristic parameters, input torque of the first test motor 1, control torque of the second test motor 2 and the third test motor 8, read torque and rotating speed of the first torque sensor 6, the second torque sensor 5 and the third torque sensor 7, and compare efficiency and NVH of planetary gears with different characteristic parameters.

[0081] Further, in some embodiments of the application, in step S6, influence of different planetary gear design parameters such as module, tooth number, pressure angle, spiral angle and tooth width on efficiency and NVH can also be studied.

[0082] The power split planetary gear set test system and test method provided by the embodiments of the application can be well used to study power split planetary gears, provide a powerful test matching system for development of hybrid transmission, solve use of power planetary gears with different characteristic parameters, design and matching design of engine and generator parameters, make the hybrid system better use power split planetary gears, facilitate designers to better verify theoretical design parameters, and shorten development cycle, make matching of engine and generator more perfect; the application can complete the following test contents: efficiency of different path planetary gears (fixed different elements), efficiency of planetary gears during power split, NVH of different path planetary gears (fixed different elements), NVH of planetary gears during power split, engine and generator parameter simulation verification required by different planetary gear characteristic parameters, influence of different planetary gear characteristic parameters on efficiency and NVH; better study planetary gears, especially efficiency and NVH of different transmission paths of power split planetary gears, and how planetary gears with different characteristic parameters match engine and generator parameters, and how to study through theoretical analysis and actual test.

[0083] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0084] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present 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 was placed inside a silencer box, which was 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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