Hybrid power tractor axle box assembly four-wheel drive test system and test method

Abstract

The invention relates to the technical field of hybrid power tractor transmission system testing, and discloses a hybrid power tractor axle box assembly four-wheel drive testing system and method, and the system comprises a testing system motor module, an analog power supply, and a control unit. The test system motor module comprises a driving motor, a first loading motor, a second loading motor and a third loading motor, the driving motor is connected with an input shaft of the axle box assembly and used for simulating engine output, the first loading motor and the second loading motor are connected with two rear wheels of the axle box assembly in a one-to-one correspondence mode, and the third loading motor is used for simulating engine output. The third loading motor is connected with the front drive; the simulation power supply is connected with a first product motor and a second product motor in the axle box assembly. And the control unit is used for coordinating the working modes of the driving motor, the first loading motor, the second loading motor, the third loading motor, the first product motor, the second product motor and the simulation power supply, so that testing of multiple working conditions is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hybrid tractor transmission system testing, in particular to a hybrid tractor axle housing assembly four-wheel drive test system and test method. BACKGROUND

[0002] With the development of the agricultural industry, hybrid tractors gradually become the development direction due to their advantages such as simple structure, energy saving and environmental protection, and good power performance. The tractor axle housing assembly, as an important component, directly affects the performance, work efficiency, and reliability of the tractor.

[0003] The existing hybrid tractor axle housing assembly four-wheel drive test is tested on the whole tractor, mainly for whole vehicle level subjective test: empty load test, load test, etc. are carried out in the test site.

[0004] However, the whole vehicle level test cannot accurately simulate the working state of the hybrid tractor axle housing assembly under different power modes. There is a lack of test system and test method for hybrid tractor axle housing assembly pure electric working condition and hybrid drive working condition, so the four-wheel drive performance of the hybrid tractor axle housing assembly cannot be truly reflected. SUMMARY

[0005] To solve the above technical problems, the present application provides a hybrid tractor axle housing assembly four-wheel drive test system and test method, which meets various test requirements and also meets various working modes.

[0006] The first aspect of the present application provides a hybrid tractor axle housing assembly four-wheel drive test system, comprising: a test system motor module, an analog power supply, and a control unit; The test system motor module includes a drive motor and first, second, and third load motors, the drive motor is connected to the input shaft of the axle housing assembly for simulating engine output, the first and second load motors are respectively connected to the two rear wheels of the axle housing assembly, and the third load motor is connected to the front drive; The analog power supply is connected to the first and second product motors in the axle housing assembly; The control unit is used to coordinate the working modes of the drive motor, the first load motor, the second load motor, the third load motor, the first product motor, the second product motor, and the analog power supply, and realize the test of multiple working conditions.

[0007] Optionally, the control unit can control the drive motor, the first load motor, the second load motor, the third load motor, the analog power supply, the first product motor, and the second product motor to enter at least one working mode, and the working mode includes: idle mode, electric mode, power generation mode, torque mode, speed mode, engine simulation mode, and idle speed mode.

[0008] Optionally, the first and second loading motors can operate in torque difference mode to simulate the differential load between the left and right wheels of the rear drive; the first and second loading motors and the third loading motor can operate in torque difference mode to simulate the load distribution between the front drive and the rear drive.

[0009] A second aspect of the present invention provides a four-wheel drive test method for a hybrid tractor axle assembly, employing the aforementioned test system, and comprising the following steps: According to the preset test conditions, the working modes of the drive motor, the first loading motor, the second loading motor, the third loading motor, the simulated power supply, the first product motor and the second product motor are set. The test conditions include: pure electric condition, parking power generation condition, working condition, working energy recovery condition, power reversing condition and reverse condition. Perform torque control, speed control, or generator control corresponding to the test conditions; The system collects torque, speed, current, voltage parameters, and CAN message parameters of the axle assembly during the testing process to evaluate the performance of the axle assembly.

[0010] Optionally, the pure electric driving condition test includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter electric mode and drive the axle assembly; The first and second loading motors apply positive loading to the rear drive, while the third loading motor applies positive loading to the front drive. Enter torque mode and perform the test.

[0011] Optionally, the test for the parking generator condition includes the following steps: The drive motor enters engine simulation mode, and the first product motor enters generator mode. The first loading motor, the second loading motor, and the third loading motor enter idle mode; The first product's motor was tested by charging a simulated power source.

[0012] Optionally, the testing of operating conditions includes the following steps: The drive motor enters engine simulation mode and adjusts its speed according to the testing requirements of the second product motor. The first product motor and the second product motor enter electric mode, using torque control and speed control respectively; The first and second loading motors apply positive loading to the rear drive, while the third loading motor applies positive loading to the front drive. The first, second, and third loading motors entered torque mode and performed the test.

[0013] Optionally, testing of the energy recovery operation includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter power generation mode; The first loading motor, the second loading motor, and the third loading motor enter the reverse loading mode; The first product motor and the second product motor were used to perform a charging test on the simulated power supply.

[0014] Optionally, the power reversing operation includes two sub-operational conditions: forward reversing and reverse reversing. The test includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter electric mode and output reverse torque to achieve commutation. The first loading motor, the second loading motor, and the third loading motor apply forward or reverse loading according to the commutation direction; Perform a commutation process test.

[0015] Optional, the test for the backward condition includes the following steps: The drive motor enters engine simulation mode; The motor of the first product enters electric mode, and the motor of the second product enters generator mode. The first loading motor, the second loading motor, and the third loading motor respectively perform forward loading; Perform a backtracking test.

[0016] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art: This invention provides a four-wheel drive testing system and method for a hybrid tractor axle assembly. By setting a drive motor to simulate engine output, and using a first, second, and third loading motor to apply forward or reverse loading to the front and rear drives, and simulating power generation by connecting a simulated power source to the first and second product motors, this system can meet diverse testing needs, including pure electric drive, engine drive, and hybrid drive. It also satisfies testing requirements for various operating modes, including pure electric operation, parking power generation, operation, energy recovery operation, power reversing operation, and reverse operation. It is less affected by external environmental factors, accurately simulates the actual operating conditions of a hybrid tractor, and comprehensively tests the performance of the axle assembly through quantifiable test indicators, providing a reliable basis for the research and optimization of hybrid tractors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a four-wheel drive test system for a hybrid tractor axle assembly provided in an embodiment of the present invention; Figure 2This is a flowchart of the pure electric operating condition testing method provided in an embodiment of the present invention; Figure 3 This is a flowchart of the parking generator operating condition test method provided in an embodiment of the present invention; Figure 4 This is a flowchart of the working condition testing method provided in an embodiment of the present invention; Figure 5 A flowchart of the operational energy recovery test method provided in an embodiment of the present invention; Figure 6 This is a flowchart of the power commutation working condition test method provided in an embodiment of the present invention; Figure 7 The flowchart is a method for testing backward working conditions provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Drive motor; 2. First loading motor; 3. Second loading motor; 4. Third loading motor; 5. First product motor; 6. Second product motor; 7. Analog power supply; 8. Bridge assembly. Detailed Implementation

[0019] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 the technical solution of this invention 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 invention.

[0021] The present invention will be described below through several specific embodiments. To keep the following description of the embodiments clear and concise, detailed descriptions of known functions and components may be omitted. When any component of an embodiment of the present invention appears in more than one drawing, the component may be represented by the same reference numerals in each drawing.

[0022] like Figure 1As shown, the first embodiment of the present invention provides a four-wheel drive test system for an axle assembly 8, including: a test system motor module, a simulation power supply 7, and a control unit; the test system motor module (simulating resistance) includes a drive motor 1, a first loading motor 2, a second loading motor 3, and a third loading motor 4. The drive motor 1 is connected to the input shaft of the axle assembly 8 to simulate engine output. The first loading motor 2 and the second loading motor 3 are respectively connected to the two rear wheels of the axle assembly 8, and the third loading motor 4 is connected to the front drive; the simulation power supply 7 is connected to the first product motor 5 and the second product motor 6 in the axle assembly 8, and the first product motor 5 and the second product motor 6 form a product system motor; the control unit is used to coordinate the working modes of the test system motor module, the simulation power supply 7, the first product motor 5, the second product motor 6, and the simulation power supply 7 to realize testing under various working conditions.

[0023] The input shaft of the hybrid axle assembly is connected to the drive motor 1 via a first transmission shaft. The first loading motor 2 is connected to one rear wheel of the hybrid axle assembly via a second transmission shaft. The first loading motor 2 is connected to the other rear wheel of the hybrid axle assembly via a second transmission shaft. The third loading motor 4 is connected to the front drive output transmission shaft of the hybrid axle assembly via a fourth transmission shaft. The first product motor 5 and the second product motor 6 are respectively connected to the analog power supply 7 via power lines.

[0024] This invention provides a four-wheel drive test system for an axle assembly 8. By setting a drive motor 1 to simulate engine output, and using a first loading motor 2, a second loading motor 3, and a third loading motor 4 to apply forward or reverse loading to the front and rear drives, and by simulating power generation through a simulated power supply 7 connected to a first product motor 5 and a second product motor 6, it can meet a variety of testing needs, including pure electric drive, engine drive, and hybrid drive. It also meets the testing needs of various working modes, including pure electric operation, parking power generation, operation, operation energy recovery, power reversing, and reverse operation. It is less affected by the external environment and can accurately simulate the actual working conditions of a hybrid tractor. Through quantifiable test indicators, it comprehensively tests the performance of the axle assembly, providing a reliable basis for the research and optimization of hybrid tractors.

[0025] Optionally, the control unit can control the drive motor 1, the first loading motor 2, the second loading motor 3, the third loading motor 4, the analog power supply 7, the first product motor 5, and the second product motor 6 to enter at least one operating mode. Operating modes include: idle mode, electric mode, generator mode, torque mode, speed mode, engine simulation mode, and idle speed mode, thereby fulfilling diverse testing requirements for pure electric drive, engine drive, and hybrid drive. It also meets testing requirements for various operating modes, including pure electric condition, parking generator condition, working condition, working energy recovery condition, power reversing condition, and reverse condition.

[0026] Optionally, the first loading motor 2 and the second loading motor 3 can operate in torque difference mode to simulate the differential load between the left and right wheels of the rear drive; the first loading motor 2 and the second loading motor 3 and the third loading motor 4 can operate in torque difference mode to simulate the load distribution between the front drive and the rear drive.

[0027] A test method for a four-wheel drive axle assembly, using the aforementioned test system, includes the following steps: According to the preset test conditions, the working modes of drive motor 1, first loading motor 2, second loading motor 3, third loading motor 4, analog power supply 7, first product motor 5 and second product motor 6 are set. The test conditions include: pure electric condition, parking power generation condition, working condition, working energy recovery condition, power reversal condition and reverse condition. Perform torque control, speed control, or generator control corresponding to the test conditions; The system collects torque, speed, current, voltage parameters, and 8CAN message parameters of the axle assembly during the testing process to complete the performance evaluation of the axle assembly.

[0028] Optionally, the pure electric driving condition test includes the following steps: Drive motor 1 enters idle mode; The first product motor 5 and the second product motor 6 enter electric mode and drive the axle assembly; The first loading motor 2 and the second loading motor 3 apply positive loading to the rear drive, and the third loading motor 4 applies positive loading to the front drive. Enter torque mode and perform the test.

[0029] (I) Pure Electric Operating Condition Test Method Drive motor 1 enters idle mode, where it is uncontrolled and can move freely without participating in the operation. First product motor 5 and second product motor 6 drive axle assembly 8. First loading motor 2 and second loading motor 3 apply positive loading control to the rear drive of axle assembly 8, then enter torque mode. Third loading motor 4 applies positive loading control to the front drive of axle assembly 8, then enters torque mode. First product motor 5 and second product motor 6 use speed mode to control the speed of the hybrid tractor axle assembly, performing variable speed tests according to the test conditions. First loading motor 2 and second loading motor 3 use torque control to control the torque output from the two rear drive wheels of the hybrid tractor axle assembly, performing variable torque tests. Third loading motor 4 also uses torque control to control the front drive torque of the hybrid tractor axle assembly. By controlling the current of first loading motor 2, second loading motor 3, and third loading motor 4, different torques are generated, performing variable torque tests.

[0030] like Figure 2As shown, the specific operation is as follows: Set the bridge assembly 8 operating condition to: If the simulated power supply 7 SOC value is higher than a certain value, enter the pure electric operating condition; otherwise, return to the previous step (return to the bridge assembly 8 operating condition setting state and select again). Drive motor 1 enters idle mode, and the first loading motor 2, the second loading motor 3, and the third loading motor 4 enter forward loading. In the next step, drive motor 1, the first loading motor 2, the second loading motor 3, the third loading motor 4, the first product motor 5, and the second product motor 6 work together to complete the test. The first loading motor 2, the second loading motor 3, and the third loading motor 4 enter torque mode, that is, control the torque to reach the target value. The first loading motor 2 and the second loading motor 3 enter torque difference mode, that is, set the first loading motor 2 to a fixed torque and the second loading motor 3 to a fixed torque, with a fixed difference between the two. The first loading motor 2, the second loading motor 3, and the third loading motor 4 enter torque difference mode, and the control unit allocates the loading torque of the first loading motor 2, the second loading motor 3, and the third loading motor 4 according to the product design requirements parameters. The first product motor 5 and the second product motor 6 both work in electric mode, which may be in... In electric or generator mode, the system determines whether the direction of travel is forward based on the resolver sensor; otherwise, it returns to the previous level, meaning both the first product motor 5 and the second product motor 6 are in standby mode. If so, it enters speed mode, controlling the speed of the first product motor 5 and the second product motor 6 to reach the target value. The speed mode of the first product motor 5 and the second product motor 6 is combined with the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4. In total torque mode, the first loading motor 2, the second loading motor 3, and the third loading motor 4 distribute torque and work together to achieve torque-speed coupling (the motors simulate the torque-speed coupling characteristics of the load according to changes in load size; drive output coupling: the first loading motor 2, the second loading motor 3, and the third loading motor 4 achieve reasonable distribution of output torque according to requirements). First, it enters pre-test (break-in test), then formal test, and finally, the pure electric condition test ends.

[0031] Optionally, the test for the parking generator condition includes the following steps: Drive motor 1 enters engine simulation mode, and drives the first product motor 5 into power generation mode; The first loading motor 2, the second loading motor 3, and the third loading motor 4 enter idle mode; The first product, motor 5, was tested to charge the analog power supply 7.

[0032] (II) Test method for parking generator operation Drive motor 1 simulates an engine, driving the first product motor 5 into power generation mode. Drive motor 1 drives the first product motor 5, which rotates to charge the simulated power supply 7. A control unit coordinates the operation (torque, speed, etc.) of drive motor 1, the three load motors, the first product motor 5, and the second product motor 6. Load motors 2, 3, and 4 enter idle mode, completing the parking power generation test.

[0033] like Figure 3 As shown, the operating condition of the axle assembly 8 is set to: parking power generation condition. Otherwise, return to the previous step; otherwise, proceed to the test: drive motor 1 enters engine mode to simulate an engine. First loading motor 2, second loading motor 3, and third loading motor 4 enter idle mode; first product motor 5 enters power generation mode, and second product motor 6 enters idle mode; drive motor 1 drives first product motor 5, and first product motor 5 charges simulated power supply 7. First, pre-charging is performed, followed by formal charging. After completion, the parking power generation condition test ends.

[0034] Optionally, the testing of operating conditions includes the following steps: Drive motor 1 enters engine simulation mode and adjusts its speed according to the test requirements of the second product motor 6; The first product motor 5 and the second product motor 6 enter electric mode, using torque control and speed control respectively; The first loading motor 2 and the second loading motor 3 apply positive loading to the rear drive, and the third loading motor 4 applies positive loading to the front drive. The first loading motor 2, the second loading motor 3, and the third loading motor 4 enter torque mode and perform the test.

[0035] (III) Operating Condition Testing Methods Drive motor 1 simulates an engine by mimicking the accelerator pedal opening. Drive motor 1 responds to the control of the first product motor 5. The second product motor 6 adjusts the speed of drive motor 1 according to test requirements, so that drive motor 1 operates within the corresponding range according to test requirements (the first product motor 5 and the second product motor 6 adopt a dual-motor power split hybrid technology route; through the designed torque, speed, and power distribution, drive motor 1 works in coordination with the first product motor 5 and the second product motor 6 through the control unit). The first loading motor 2 and the second loading motor 3 perform positive loading control on the rear drive of the axle assembly 8, and the third loading motor 4 performs positive loading control on the front drive of the axle assembly 8; the test system motors and product system motors complete the corresponding tests.

[0036] like Figure 4As shown, the working condition of the bridge assembly 8 is set as: working condition. Otherwise, return to the previous step. If yes, proceed to test: drive motor 1 enters simulated engine mode; first loading motor 2, second loading motor 3, and third loading motor 4 enter forward loading. Next, first loading motor 2, second loading motor 3, and third loading motor 4 enter torque mode, first loading motor 2 and second loading motor 3 enter torque difference mode, and first loading motor 2, second loading motor 3, and third loading motor 4 enter torque difference mode, distributing loading torque to first loading motor 2, second loading motor 3, and third loading motor 4; first product motor 5 and second product motor 6 enter electric mode, first product motor 5 uses torque control, and second product motor 6 uses speed control. First product motor 5 and second product motor 6 are coupled with drive motor 1 for drive output; the drive output of first product motor 5 and second product motor 6 is coupled with the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4 for torque-speed coupling. First, enter pre-test, then formal test. After completion, the working condition test ends.

[0037] Optionally, testing of the energy recovery operation includes the following steps: Drive motor 1 enters idle mode; The first product motor 5 and the second product motor 6 enter the power generation mode; The first loading motor 2, the second loading motor 3, and the third loading motor 4 enter the reverse loading mode; The first product motor 5 and the second product motor 6 perform a charging test on the simulated power supply 7.

[0038] (iv) Test methods for energy recovery operation conditions Drive motor 1 simulates an engine and is in an idling state. That is, the drive motor 1 speed is determined according to the idle speed of a real engine. The first product motor 5 and the second product motor 6 are in a power generation state. That is, according to the situation of the simulated power supply 7, the control unit determines the SOC value of the simulated power supply 7. If it is lower than a certain value, it enters the charging state. The first loading motor 2 and the second loading motor 3 perform reverse loading control on the rear drive of the axle assembly 8, and the third loading motor 4 performs reverse loading control on the front drive of the axle assembly 8; thus completing the corresponding test.

[0039] like Figure 5As shown, the working condition of the bridge assembly 8 is set as: working energy recovery condition. Otherwise, return to the previous step. If yes, proceed to the test: drive motor 1 enters engine mode and idles. First loading motor 2, second loading motor 3, and third loading motor 4 enter reverse loading. Next, first loading motor 2, second loading motor 3, and third loading motor 4 enter torque mode. First loading motor 2 and second loading motor 3 enter torque difference mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter torque difference mode, distributing loading torque to first loading motor 2, second loading motor 3, and third loading motor 4. First product motor 5 and second product motor 6 enter power generation mode. First product motor 5 and second product motor 6 are coupled with drive motor 1 for drive output. The drive output of first product motor 5 and second product motor 6 is coupled with the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4 for torque-speed coupling to charge the simulated power supply 7. First, pre-charging is performed, then formal charging is performed. After completion, the working energy recovery condition test ends.

[0040] Optionally, the power reversing operation includes two sub-operational conditions: forward reversing and reverse reversing. The test includes the following steps: Drive motor 1 enters idle mode; The first product motor 5 and the second product motor 6 enter electric mode and output reverse torque to achieve commutation. The first loading motor 2, the second loading motor 3, and the third loading motor 4 perform forward or reverse loading according to the reversing direction; Perform a commutation process test.

[0041] (v) Test method for power reversing operation Drive motor 1 simulates an engine. First product motor 5 and second product motor 6 are in electric state. By changing the DC power direction of first product motor 5 and second product motor 6, reverse torque is generated to realize forward and reverse power reversal. First loading motor 2 and second loading motor 3 perform forward and reverse loading control on the rear drive of axle assembly 8, and third loading motor 4 performs forward and reverse loading control on the front drive of axle assembly 8; thus completing the corresponding shift performance test.

[0042] like Figure 6As shown, the axle assembly 8 is set to the following operating condition: forward power shifting condition. Otherwise, return to the previous step. If yes, proceed to the test: Drive motor 1 enters engine mode and selects idle mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter forward loading. Next, first loading motor 2, second loading motor 3, and third loading motor 4 enter torque mode. First loading motor 2 and second loading motor 3 enter torque difference mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter torque difference mode, distributing loading torque to first loading motor 2, second loading motor 3, and third loading motor 4. First product motor 5 and second product motor 6 enter electric mode. First product motor 5 uses torque mode with reverse torque, and second product motor 6 uses torque mode with reverse torque. First product motor 5 and second product motor 6, together with drive motor 1 (simulating engine), output planetary carrier commutation. The output planetary carrier commutation and the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4 are coupled for torque and speed, completing the forward to reverse power shift. The test ends.

[0043] Set the axle assembly 8 operating condition to: reverse power shift condition; otherwise, return to the previous step; otherwise, proceed to the test: drive motor 1 enters engine mode and selects idle mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter reverse loading. Next, first loading motor 2, second loading motor 3, and third loading motor 4 enter torque mode. First loading motor 2 and second loading motor 3 enter torque difference mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter torque difference mode, distributing loading torque to first loading motor 2, second loading motor 3, and third loading motor 4. First product motor 5 and second product motor 6 enter electric mode. First product motor 5 uses positive torque in torque mode, and second product motor 6 uses positive torque in torque mode. First product motor 5 and second product motor 6, together with drive motor 1 (simulating engine), output planetary carrier commutation. Output planetary carrier commutation and the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4 are coupled for torque and speed. After completion, reverse to forward power shift, and the test ends.

[0044] Optional, the test for the backward condition includes the following steps: Drive motor 1 enters engine simulation mode; The first product motor 5 enters electric mode, and the second product motor 6 enters generator mode. The first loading motor 2, the second loading motor 3, and the third loading motor 4 respectively perform forward loading; Perform a backtracking test.

[0045] (vi) Test method for reverse working condition; Drive motor 1 simulates an engine, first product motor 5 is in electric state, second product motor 6 is in generator state, first loading motor 2 and second loading motor 3 perform positive loading control on the rear drive of axle assembly 8, and third loading motor 4 performs positive loading control on the front drive of axle assembly 8; complete the corresponding test.

[0046] like Figure 7 As shown, the bridge assembly 8 is set to the following operating conditions: reverse condition; otherwise, return to the previous step; otherwise, proceed to test: drive motor 1 enters engine mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter forward loading. Next, first loading motor 2, second loading motor 3, and third loading motor 4 enter torque mode. First loading motor 2 and second loading motor 3 enter torque difference mode. First loading motor 2, second loading motor 3, and third loading motor 4 enter torque difference mode, distributing loading torque to first loading motor 2, second loading motor 3, and third loading motor 4. First product motor 5 enters electric mode, and second product motor 6 enters generator mode. First product motor 5 uses torque control, and second product motor 6 uses speed control. First product motor 5 and second product motor 6 are coupled with drive motor 1 (simulating engine) for drive output. The drive output of the product system motors is coupled with the total torque mode of drive motor 1, first loading motor 2, second loading motor 3, and third loading motor 4 for torque-speed coupling. First, enter pre-test, then formal test, and after reversing, the test ends.

[0047] The above is a four-wheel drive test method for axle assembly proposed in this invention, which meets a variety of test requirements (pure electric drive, engine drive, hybrid drive, etc.) and also meets the test requirements of various working modes (pure electric condition, parking power generation condition, working condition, working energy recovery condition, power reversing condition, reverse condition, etc.).

[0048] The above inventions are merely a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A four-wheel drive testing system for a hybrid tractor axle assembly, characterized in that, include: Test system motor module, analog power supply and control unit; The test system motor module includes a drive motor, a first loading motor, a second loading motor, and a third loading motor. The drive motor is connected to the input shaft of the axle assembly to simulate engine output. The first and second loading motors are respectively connected to the two rear wheels of the axle assembly. The third loading motor is connected to the front drive. The analog power supply is connected to the first product motor and the second product motor in the bridge assembly, respectively. The control unit is used to coordinate the working modes of the drive motor, the first loading motor, the second loading motor, the third loading motor, the first product motor, the second product motor, and the analog power supply to achieve testing under various working conditions.

2. The hybrid tractor axle assembly four-wheel drive test system as described in claim 1, characterized in that, The control unit can control the drive motor, the first loading motor, the second loading motor, the third loading motor, the analog power supply, the first product motor, and the second product motor to enter at least one working mode. The working modes include: idle mode, electric mode, generator mode, torque mode, speed mode, engine simulation mode, and idle speed mode.

3. The hybrid tractor axle assembly four-wheel drive test system as described in claim 1, characterized in that, The first and second loading motors can operate in torque difference mode to simulate the differential load between the left and right wheels of the rear drive; the first and second loading motors and the third loading motor can operate in torque difference mode to simulate the load distribution between the front drive and the rear drive.

4. A method for testing the four-wheel drive of a hybrid tractor axle assembly, using the testing system described in any one of claims 1-3, characterized in that, Includes the following steps: According to the preset test conditions, the working modes of the drive motor, the first loading motor, the second loading motor, the third loading motor, the simulated power supply, the first product motor and the second product motor are set. The test conditions include: pure electric condition, parking power generation condition, working condition, working energy recovery condition, power reversal condition and reverse condition. Perform torque control, speed control, or power generation control corresponding to the test conditions; The system collects torque, speed, current, voltage parameters, and CAN message parameters of the axle assembly during the testing process to evaluate the performance of the axle assembly.

5. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The test under pure electric operating conditions includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter electric mode and drive the axle assembly; The first and second loading motors apply positive loading to the rear drive, while the third loading motor applies positive loading to the front drive. Enter torque mode and perform the test.

6. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The test for the parking generator operation includes the following steps: The drive motor enters engine simulation mode, and the first product motor enters generator mode. The first loading motor, the second loading motor, and the third loading motor enter idle mode; The first product's motor was tested by charging a simulated power source.

7. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The testing of the operating conditions includes the following steps: The drive motor enters engine simulation mode and adjusts its speed according to the testing requirements of the second product motor. The first product motor and the second product motor enter electric mode, using torque control and speed control respectively; The first and second loading motors apply positive loading to the rear drive, while the third loading motor applies positive loading to the front drive. The first, second, and third loading motors entered torque mode and performed the test.

8. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The testing of the energy recovery operation includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter power generation mode; The first loading motor, the second loading motor, and the third loading motor enter the reverse loading mode; The first product motor and the second product motor were used to perform a charging test on the simulated power supply.

9. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The power reversing operation includes two sub-operational conditions: forward reversing and reverse reversing. The test includes the following steps: The drive motor enters idle mode; The first product motor and the second product motor enter electric mode and output reverse torque to achieve commutation. The first loading motor, the second loading motor, and the third loading motor apply forward or reverse loading according to the commutation direction; Perform a commutation process test.

10. The four-wheel drive test method for a hybrid tractor axle assembly as described in claim 4, characterized in that, The test for the reversing condition includes the following steps: The drive motor enters engine simulation mode; The motor of the first product enters electric mode, and the motor of the second product enters generator mode. The first loading motor, the second loading motor, and the third loading motor respectively perform forward loading; Perform a backtracking test.

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