Transfer case offline detection method and system and electronic equipment

Abstract

The invention relates to a transfer case offline detection method and system and electronic equipment, and belongs to the technical field of electronics. The method comprises the steps of controlling the transfer case to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an execution motor in the transfer case during the first round of static self-learning, and obtaining a first round of static self-learning test result according to the first mechanical zero position and the first position; if the result of the first-round static self-learning test shows that the test is passed, controlling the transfer case to perform a running-in test; after the running-in test is carried out on the transfer case, the transfer case is controlled to carry out a second round of static self-learning test, and a second mechanical zero position, a second position and a first value of the execution motor during the second round of static self-learning are obtained; and obtaining a second round of static self-learning test result according to the first position, the second mechanical zero position, the second position and the first value. Potential fault problems can be found through a series of tests, so that measures are taken in advance, and the performance and quality of products are improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and specifically relates to a transfer case offline detection method, system and electronic equipment. Background Art

[0002] Transfer case end-of-line inspection is an important step to ensure that the quality of the car meets the standard before it leaves the factory. This process is crucial to ensure vehicle performance, safety and reliability. However, the current transfer case end-of-line inspection items mainly include: loading the input end of the transfer case and testing the output end speed and torque. It mainly focuses on testing the function of the transfer case, and there are problems with poor product performance and low product quality. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a transfer case off-line detection method, system and electronic equipment to improve the problems of poor product performance and low product quality in the current transfer case off-line detection project.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a transfer case offline detection method, including: controlling the transfer case to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an actuator motor in the transfer case during the first round of static self-learning, and obtaining a first round of static self-learning test result according to the first mechanical zero position and the first position, wherein the first position is the position of the actuator motor when the clutch in the transfer case starts to transmit torque; if the first round of static self-learning test result characterizes that the test has passed, controlling the transfer case to perform a running-in test; after performing the running-in test on the transfer case, controlling the transfer case to perform a second round of static self-learning test, and obtaining a second mechanical zero position, a second position and a first value of the actuator motor during the second round of static self-learning, wherein the second position is the position of the actuator motor when the clutch starts to transmit torque, and the first value is the difference between the maximum value and the minimum value of the actuator motor position when the clutch starts to transmit torque during the second round of static self-learning; obtaining a second round of static self-learning test result according to the first position, the second mechanical zero position, the second position and the first value.

[0006] In the above embodiment, the first round of static self-learning test is performed by controlling the transfer case, the first mechanical zero position and the first position of the executing motor during the first round of static self-learning are obtained, and the test result of the first round of static self-learning is obtained. If the first round of static self-learning test is passed, the transfer case is controlled to perform a running-in test; then the transfer case is controlled to perform a second round of static self-learning test, the second mechanical zero position, the second position and the first value of the executing motor during the second round of static self-learning are obtained, and the test result of the second round of static self-learning is obtained; because the executing motor controls the clutch of the transfer case through the transmission mechanism, the first round of static self-learning test can ensure that the executing motor accurately places the clutch in the correct starting position, providing accurate results for subsequent operations. reference point; performing a transfer case running-in test after the first round of static self-learning is helpful to run-in the clutch assembly, so that its torque transmission characteristics reach a stable state, reduce initial wear and tear, and increase the service life and reliability of the clutch. It can also optimize the clutch performance, ensure that the clutch is smoother in actual use, and reduce failures caused by insufficient running-in; performing a second round of static self-learning test after the clutch running-in test ensures that the position of the clutch is still accurate after running-in, meeting the product's requirements for precise position control; this series of tests can help improve the responsiveness of the transfer case and help discover potential faults, so that measures can be taken in advance to improve product performance and quality.

[0007] In combination with the first aspect embodiment, in a possible implementation manner, controlling the transfer case to perform a running-in test includes: controlling the input shaft speed and the output shaft speed of the transfer case, and controlling the actuator motor in the transfer case to run to a preset first target position under a position control mode, and controlling the actuator motor in the transfer case to maintain a preset first time length at the first target position.

[0008] In the above embodiment, by controlling the input shaft speed and output shaft speed of the transfer case and controlling the actuator motor in the transfer case to run to a preset first target position under the position control mode, and controlling the actuator motor in the transfer case to maintain a preset first time length at the first target position, a running-in test is performed on the transfer case to ensure that the various components of the clutch can be fully run-in before actual use, improve the consistency and coordination between the components, thereby improving the overall performance of the entire clutch, ensuring that the clutch can work smoothly, and thus improving the performance of the product; at the same time, the running-in helps to reduce the early wear of the clutch components, and can extend the service life of the clutch, thereby improving the quality of the product.

[0009] In combination with the embodiment of the first aspect, in a possible implementation manner, after obtaining the second position of the actuator motor during the second round of static self-learning, the method further includes: controlling the input shaft speed and the output shaft speed of the transfer case, and controlling the actuator motor in the transfer case to run from a preset second target position in a position control mode, and obtaining the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements, wherein the test requirements include the absolute value of the difference between the forward torque of the clutch in the transfer case and the preset first target torque being within a first threshold range; and obtaining the test result of the clutch in the transfer case based on the third position and the second position.

[0010] In the above embodiment, by controlling the input shaft speed and output shaft speed of the transfer case and controlling the actuator motor in the transfer case to run from a preset second target position in the position control mode, the third position of the actuator motor is obtained when the forward torque of the clutch in the transfer case meets the test requirements, and the test result of the clutch in the transfer case is obtained according to the third position and the second position; by controlling the operation of the actuator motor to continuously adjust the clutch compression degree, the position of the actuator motor when the clutch in the transfer case starts to transmit torque is actually measured, which can not only verify whether the position of the actuator motor when the clutch in the transfer case starts to transmit torque obtained by static self-learning is accurate, but also determine whether there is any abnormality in the physical properties of the clutch, which is helpful to discover potential problems in advance, so as to take measures in advance to improve product quality and performance.

[0011] In combination with the embodiment of the first aspect, in a possible implementation manner, the obtaining of the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements includes: if the forward torque is greater than the first target torque, controlling the step size of the actuator motor to gradually decrease, controlling the actuator motor to maintain a preset second time length at each position, and when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range, obtaining the third position of the current actuator motor; or, if the forward torque is less than the first target torque, controlling the step size of the actuator motor to gradually increase, controlling the actuator motor to maintain a preset second time length at each position, and when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range, obtaining the third position of the current actuator motor.

[0012] In the above embodiment, by judging the magnitude relationship between the forward torque and the first target torque, the execution motor is controlled to perform corresponding actions according to the magnitude relationship between the forward torque and the first target torque, so that when the absolute value of the difference between the forward torque and the first target torque is within the first threshold range, the third position of the current execution motor is obtained, so as to achieve the purpose of accurately controlling the position of the execution motor, so that the difference between the torque transmitted by the clutch and the first target torque is within the error range, thereby improving the accuracy of the clutch test results in the transfer case, optimizing the performance of the clutch, and thus improving the quality of the product.

[0013] In combination with the embodiment of the first aspect, in a possible implementation manner, after the second round of static self-learning test result characterization test is passed, the method also includes: controlling the input shaft speed and the output shaft speed of the transfer case, and the actuator motor in the transfer case to start running from a preset third target position in a position control mode according to a preset position gradient rule, wherein the preset position gradient rule includes multiple positions; obtaining the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time length; and obtaining the torque transmission characteristic test result of the transfer case according to each position of the actuator motor and the forward torque.

[0014] In the above embodiment, by controlling the input shaft speed and the output shaft speed of the transfer case, and the actuator motor in the transfer case running from a preset third target position according to a preset position gradient rule in the position control mode, the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time period is obtained, and according to each position of the actuator motor and the forward torque, the torque transmission characteristic test result of the transfer case is obtained; by testing the torque transmission characteristic of the transfer case, the torque transmission capability of the transfer case can be evaluated to ensure that it meets the actual use requirements, and the torque transmission performance of the transfer case can be fully understood to provide data support for improving the performance of the product; the results of the torque transmission characteristic test of the transfer case can also be used to optimize the transfer case, so as to improve the driving performance and stability of the vehicle.

[0015] In combination with the embodiment of the first aspect, in a possible implementation manner, after the second round of static self-learning test result characterization test is passed, the method further includes: testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions through the following steps: controlling the input shaft speed and output shaft speed of the transfer case, and controlling the actuator motor in the transfer case to run to a preset fourth target position under position control mode, and obtaining the target NVH measurement data of the transfer case during the whole process of the actuator motor maintaining the fourth target position for a preset fourth time length; based on the target NVH measurement data, obtaining the test results of the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions.

[0016] In the above embodiment, by controlling the input shaft speed and output shaft speed of the transfer case and controlling the actuator motor in the transfer case to run to a preset fourth target position in the position control mode, the target NVH measurement data of the transfer case is obtained during the whole process of the actuator motor maintaining the preset fourth time length at the fourth target position, and according to the target NVH measurement data, the NVH performance test results of the transfer case under the constant speed difference and constant speed torque transmission conditions are obtained; testing the NVH performance of the transfer case under the constant speed difference and constant speed torque transmission conditions can identify and optimize the performance of the transfer case and reduce noise and vibration; at the same time, it is helpful to diagnose and locate possible fault sources, so as to take measures in advance to avoid potential faults and improve product quality; the test results can be used to verify whether the transfer case design meets the NVH performance requirements, ensure that the product meets the expected performance standards during the development and production process, and improve the performance of the product.

[0017] In combination with the embodiment of the first aspect, in a possible implementation manner, testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions also includes: obtaining the forward torque of the clutch in the transfer case; determining whether the position of the actuator motor in the transfer case reaches a preset fourth target position based on the forward torque and a preset second target torque, wherein the second target torque is the torque transmitted by the clutch when the actuator motor in the transfer case runs to a preset fourth target position.

[0018] In the above embodiment, the current forward torque of the clutch in the transfer case is obtained; according to the forward torque and the preset second target torque, the position of the actuator motor in the transfer case is ensured to reach the preset fourth target position; the position of the actuator motor is precisely controlled at the fourth target position to meet the constant speed difference and constant speed torque transmission working condition test conditions, thereby improving the accuracy of the NVH performance test results of the transfer case under the constant speed difference and constant speed torque transmission working conditions.

[0019] In combination with the embodiment of the first aspect, in a possible implementation manner, the method further includes: testing the NVH performance of the transfer case under the conditions of no speed difference and rising and falling speed torque transmission through the following steps: controlling the actuator motor to run to a preset fifth target position under the position control mode; controlling the speed of the input shaft and the output shaft of the transfer case to increase the speed, and controlling the actuator motor to always be at the fifth target position under the position control mode during the speed increase process; controlling the speed of the input shaft and the output shaft of the transfer case to decrease the speed, and controlling the actuator motor to always be at the fifth target position under the position control mode during the speed decrease process; obtaining first NVH measurement data of the transfer case during the speed increase process, and obtaining second NVH measurement data of the transfer case during the speed decrease process; and obtaining test results of the NVH performance of the transfer case under the conditions of no speed difference and rising and falling speed torque transmission based on the first NVH measurement data and the second NVH measurement data.

[0020] In the above embodiment, by controlling the actuator motor to run to the preset fifth target position in the position control mode, the speed of the input shaft and the output shaft of the transfer case is controlled to first increase the speed and then decrease the speed, and the first and second NVH measurement data of the transfer case during the speed increase and decrease process are obtained, and the NVH performance test results of the transfer case under the conditions of no speed difference and speed increase and decrease torque transmission are obtained; the NVH performance of the transfer case is tested under the conditions of no speed difference and speed increase and decrease torque transmission, which can evaluate the NVH performance of the transfer case at different speeds, help identify possible noise and vibration sources, and take measures to optimize them; at the same time, the test results can be used to verify whether the transfer case design meets the NVH performance requirements, ensure that the product meets the expected performance standards during the development and production process, and improve the performance of the product.

[0021] In combination with the embodiment of the first aspect, in a possible implementation, the method also includes: controlling the transfer case to perform a third round of static self-learning test, obtaining a third mechanical zero position and a second value during the third round of static self-learning, wherein the second value is the difference between the maximum and minimum values ​​of the execution motor position when the clutch starts to transmit torque during the third round of static self-learning; obtaining the transfer case's third round of static self-learning test result based on the third mechanical zero position and the second value.

[0022] In the above embodiment, the third round of static self-learning test is performed on the transfer case by controlling the transfer case to obtain the third mechanical zero position and the second value during the third round of static self-learning, and the third round of static self-learning test result of the transfer case is obtained according to the third mechanical zero position and the second value; by performing the third round of static self-learning, the stability of the transfer case can be improved to ensure that the transfer case can still work stably and meet all performance standards and requirements after the above operating condition tests; at the same time, if any potential faults are found in the above operating condition tests, the third round of static self-learning can also be used as part of the diagnostic process to help identify and solve existing faults, thereby improving product quality.

[0023] In a second aspect, an embodiment of the present application provides a transfer case offline detection system, including: a transfer case; a host computer connected to the transfer case, the host computer being used to: control the transfer case to perform a first round of static self-learning test, obtain a first mechanical zero position and a first position of an actuator motor in the transfer case during the first round of static self-learning, and obtain a first round of static self-learning test result according to the first mechanical zero position and the first position, wherein the first position is the position of the actuator motor when the clutch in the transfer case starts to transmit torque; if the first round of static self-learning test result characterization test passes, control the transfer case to perform a running-in test; after performing the running-in test on the transfer case, control the transfer case to perform a second round of static self-learning test, and obtain a second mechanical zero position, a second position and a first value of the actuator motor during the second round of static self-learning, wherein the second position is the position of the actuator motor when the clutch starts to transmit torque, and the first value is the difference between the maximum value and the minimum value of the actuator motor position when the clutch starts to transmit torque during the second round of static self-learning; obtain a second round of static self-learning test result according to the first position, the second mechanical zero position, the second position and the first value.

[0024] In combination with the embodiment of the second aspect, in a possible implementation manner, the system also includes: a drive test bench for controlling the input shaft speed of the transfer case, the drive test bench being connected to the host computer and the transfer case respectively; a dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; the host computer is used to control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the actuator motor in the transfer case to run to a preset first target position under a position control mode, and control the actuator motor in the transfer case to maintain a preset first time length at the first target position.

[0025] In combination with the second aspect embodiment, in a possible implementation manner, the system further includes: a drive test bench for controlling the input shaft speed of the transfer case, the drive test bench being connected to the host computer and the transfer case respectively; a dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; the host computer is further used to: after obtaining the second position of the actuator motor during the second round of static self-learning, control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the actuator motor in the transfer case to start running from a preset second target position in a position control mode, and obtain a third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements, wherein the test requirements include that the absolute value of the difference between the forward torque of the clutch in the transfer case and the preset first target torque is within a first threshold range; and obtain the test result of the clutch in the transfer case according to the third position and the second position.

[0026] In combination with the second aspect embodiment, in a possible implementation manner, the system further includes: a drive test bench for controlling the input shaft speed of the transfer case, the drive test bench being connected to the host computer and the transfer case respectively; a dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; the host computer is further used to: after the second round of static self-learning test result characterization test is passed, control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the actuator motor in the transfer case to start running from a preset third target position according to a preset position gradient rule in a position control mode, wherein the preset position gradient rule includes multiple positions; obtain the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time length; and obtain the torque transmission characteristic test result of the transfer case according to each position of the actuator motor and the forward torque.

[0027] In combination with the second aspect embodiment, in a possible implementation manner, the system further includes: a drive test bench for controlling the input shaft speed of the transfer case, the drive test bench being connected to the host computer and the transfer case respectively; a dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; the host computer is further used for: after the second round of static self-learning test result characterization test is passed, testing the NVH performance of the transfer case under the constant speed difference and constant speed torque transmission conditions through the following steps: controlling the input shaft speed of the transfer case through the drive test bench, controlling the output shaft speed of the transfer case through the dynamometer, and controlling the actuator motor in the transfer case to run to a preset fourth target position in the position control mode, obtaining the target NVH measurement data of the transfer case during the whole process of the actuator motor maintaining the preset fourth time length at the fourth target position; and obtaining the test results of the NVH performance of the transfer case under the constant speed difference and constant speed torque transmission conditions according to the target NVH measurement data.

[0028] In combination with the second aspect embodiment, in a possible implementation manner, the host computer is also used to: obtain the forward torque of the clutch in the transfer case; determine whether the position of the actuator motor in the transfer case reaches a preset fourth target position based on the forward torque and a preset second target torque, wherein the second target torque is the torque transmitted by the clutch when the actuator motor in the transfer case runs to a preset fourth target position.

[0029] In combination with the second aspect embodiment, in a possible implementation manner, the host computer is also used to: test the NVH performance of the transfer case under the condition of no speed difference and lifting and lowering speed torque transmission through the following steps: control the actuator motor to run to a preset fifth target position under the position control mode; control the speed of the input shaft of the transfer case to increase the speed through the drive test bench, and control the speed of the output shaft of the transfer case to increase the speed through the dynamometer, and control the actuator motor to always be at the fifth target position under the position control mode during the speed increase process; control the speed of the input shaft of the transfer case to decrease the speed through the drive test bench, and control the speed of the output shaft of the transfer case to decrease the speed through the dynamometer, and control the actuator motor to always be at the fifth target position under the position control mode during the speed decrease process; obtain first NVH measurement data of the transfer case during the speed increase process and second NVH measurement data of the transfer case during the speed decrease process; and obtain a test result of testing the NVH performance of the transfer case under the condition of no speed difference and lifting and lowering speed torque transmission according to the first NVH measurement data and the second NVH measurement data.

[0030] In combination with the second aspect embodiment, in a possible implementation manner, the host computer is also used to: control the transfer case to perform a third round of static self-learning test, obtain the third mechanical zero position and the second value during the third round of static self-learning, wherein the second value is the difference between the maximum and minimum values ​​of the execution motor position when the clutch starts to transmit torque during the third round of static self-learning; obtain the transfer case's third round of static self-learning test result based on the third mechanical zero position and the second value.

[0031] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a memory and a processor, the memory being connected to the processor; the memory being used to store programs; and the processor being used to call the programs stored in the memory to execute the method provided in the above-mentioned first aspect embodiment and / or in combination with any one of the implementations of the first aspect embodiment.

[0032] Other features and advantages of the present application will be described in the following description. The purpose and other advantages of the present application can be realized and obtained through the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The above and other purposes, features and advantages of the present application will be more clear as shown in the drawings.

[0034] Figure 1 A schematic flow chart of a transfer case off-line detection method provided in an embodiment of the present application is shown.

[0035] Figure 2 A schematic diagram showing the time of the first round of static self-learning test of a transfer case provided by an embodiment of the present application and the position, time and current of the executing motor is shown.

[0036] Figure 3 A schematic diagram showing a torque transfer characteristic curve of a transfer case provided in an embodiment of the present application

[0037] Figure 4 A schematic diagram showing the principle of a transfer case off-line detection method provided in an embodiment of the present application is shown.

[0038] Figure 5 A first structural schematic diagram of a transfer case off-line detection system provided in an embodiment of the present application is shown.

[0039] Figure 6A second structural schematic diagram of the transfer case off-line detection system provided in an embodiment of the present application is shown.

[0040] Figure 7 A third structural schematic diagram of the transfer case off-line detection system provided in an embodiment of the present application is shown.

[0041] Figure 8 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following embodiments can be used as examples to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the scope of protection of the present application. It will be appreciated by those skilled in the art that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other.

[0043] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it is not necessary to further define and explain it in the subsequent drawings. At the same time, in the description of this application, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0044] Furthermore, the term "and / or" in this application is merely a term used to describe the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0045] An embodiment of the present application provides a transfer case offline detection method, which controls the transfer case to perform a first round of static self-learning test. After the first round of static self-learning test is passed, the transfer case is controlled to perform a running-in test, and then the transfer case is subjected to a second round of static self-learning test. The first round of static self-learning test is used to ensure that the transfer case can accurately identify its initial position. The running-in test can enable the various components of the transfer case to achieve the best matching state, and also helps to discover potential problems so as to adjust and repair them in advance. The second round of static self-learning test is to confirm whether the position and performance of the transfer case after running-in are as expected, which can ensure the accuracy and reliability of the transfer case in actual use. Through this series of tests, the performance and quality of the transfer case can be improved.

[0046] For ease of understanding, the following Figure 1 The flowchart shown illustrates the principle of the transfer case offline detection method provided in the embodiment of the present application. The execution subject of the transfer case offline detection method shown in the embodiment of the present application may be an electronic device or a host computer, etc. In the following example, a host computer is used as an example.

[0047] Step S10: Control the transfer case to perform a first round of static self-learning test, obtain the first mechanical zero position and the first position of the actuator motor in the transfer case during the first round of static self-learning, and obtain the first round of static self-learning test result according to the first mechanical zero position and the first position.

[0048] Before performing step S10, it is necessary to ensure that the refueling amount of the transfer case meets the design requirements, ensure that the communication function of the transfer case and the function of the execution motor in the transfer case are normal, so as to ensure that the transfer case offline detection can be carried out smoothly and reliable test results can be obtained.

[0049] In the above step S10, the host computer controls the transfer case to perform the first round of static self-learning test by calling the static self-learning command of the controller in the transfer case, and the host computer obtains the result of the transfer case self-learning, wherein the result of the transfer case self-learning is reflected by the EOL LearnStage feedback value, and the EOL LearnStage feedback value of 03 indicates that the self-learning is successful, and the EOL LearnStage feedback value of 04 indicates that the self-learning fails. When the transfer case self-learning is successful, the host computer obtains the first mechanical zero position (i.e., Zero1) and the first position (i.e., KP1) of the motor executed during the first round of static self-learning.

[0050] Among them, the first round of static self-learning test can include multiple static self-learning processes, wherein the multiple times can be 3 times. Zero1 is the position of the executing motor when the clutch is in the non-torque transmission limit position. This position is the average value of the position of the executing motor when the clutch is in the non-torque transmission limit position obtained by multiple static self-learning, which depends on the position of the ball cam of the key component inside the transfer case during assembly. KP1 is the position of the executing motor when the clutch in the transfer case starts to transmit torque. This position is the average value of the position of the executing motor when the clutch starts to transmit torque obtained by multiple static self-learning. KP1 depends on the thickness of the adjustment gasket when the transfer case is assembled to the test bench.

[0051] Among them, the transfer case needs to be assembled on the test bench for offline inspection, and the inspection is carried out after assembly. In the process of assembling the transfer case on the test bench, adjusting the gasket selection process is one of the key steps, and its purpose is to ensure that the gear clearance, bearing preload, etc. meet the design requirements by adjusting the gasket. How to assemble the transfer case on the test bench and how to ensure that the gear clearance, bearing preload, etc. meet the design requirements by adjusting the gasket are all existing technologies and will not be introduced here.

[0052] In the above step S10, the position of the actuator motor when the clutch is fully engaged, that is, the first locking position (Lock1), can also be obtained. The first locking position depends on the characteristics of the clutch itself. The above KP1 and Lock1 are both positions relative to Zero1, and the positions of the actuator motor obtained in the following content are all positions relative to the mechanical zero position.

[0053] In the above step S10, according to Zero1 and KP1, obtaining the first round of static self-learning test results may include: if Zero1 and KP1 are both within the preset threshold range, the first static self-learning test is passed. If any value of Zero1 or KP1 is not within the preset threshold range, and it is caused by an abnormal shim selection process when the transfer case is assembled to the test bench, the test program should be exited, and the shims should be reselected and retested.

[0054] The purpose of step S10 is to test the consistency of the transfer case assembly, the consistency of the adjustment gasket selection and the consistency of the clutch specifications, so as to control the quality of the product. In addition, an image can be drawn based on the time of the first round of static self-learning test and the position, time and current of the execution motor. For image drawing, please refer to Figure 2 As shown, Figure 2 This is only exemplary, and the format of the drawn image is not limited thereto. Figure 2 Mot in the figure represents the position curve of the motor during the first round of static self-learning test, and Iq current represents the current curve of the motor during the first round of static self-learning test.

[0055] Step S20: If the result of the first round of static self-learning test indicates that the test has passed, the transfer case is controlled to perform a running-in test.

[0056] The purpose of the above step S20 is to make the torque transmission characteristic of the clutch reach a stable state.

[0057] In one implementation, controlling the transfer case to perform a running-in test may include: controlling the input shaft speed and output shaft speed of the transfer case, and controlling the actuator motor in the transfer case to run to a preset first target position under a position control mode, and controlling the actuator motor in the transfer case to maintain a preset first time period at the first target position.

[0058] In one possible implementation, in the embodiment of the present application, the input shaft speed and output shaft speed of the transfer case can be controlled by the host computer by controlling the drive test bench to control the input shaft speed of the transfer case, and by controlling the dynamometer to control the output shaft speed of the transfer case. The drive test bench is used to simulate the transmission of a real vehicle and provide power to the transfer case; the dynamometer is used to control the speed of the forward output shaft of the transfer case. In another possible implementation, the input shaft speed and output shaft speed of the transfer case can also be controlled by other machines.

[0059] The preset first target position is determined based on KP1 obtained from the first round of static self-learning, ensuring that when the actuator motor is in this position, the torque transmitted by the clutch is 600NM. The first duration can be configured according to test needs. After a running-in test, you need to wait for a while until the clutch cools down before you can run the second running-in. If you continue running-in, the clutch will overheat and may be damaged.

[0060] Step S30: After the transfer case is run-in tested, the transfer case is controlled to perform a second round of static self-learning test, and the second mechanical zero position, the second position and the first value of the motor are obtained during the second round of static self-learning.

[0061] In the above step S30, the host computer controls the transfer case to perform a second round of static self-learning test by calling the static self-learning command of the controller in the transfer case. The host computer obtains the result of the transfer case self-learning. When the transfer case self-learning is successful, the host computer obtains the second mechanical zero position (i.e., Zero2), the second position (i.e., KP2) and the first value (i.e., max-min) of the motor executed during the second round of static self-learning.

[0062] Among them, the second round of static self-learning test includes multiple static self-learning, and the multiple times can be 3 times. Zero2 is the position of the execution motor when the clutch is in the non-torque transmission limit position. This position is the average value of the execution motor position when the clutch is in the non-torque transmission limit position obtained by multiple static self-learning. KP2 is the position of the execution motor when the clutch starts to transmit torque during the second round of static self-learning. This position is the average value of the position of the execution motor relative to the mechanical zero position when the clutch starts to transmit torque obtained by multiple static self-learning. max-min is the difference between the maximum and minimum values ​​of the execution motor position when the clutch starts to transmit torque during the second round of static self-learning, which is used to judge the consistency of the execution motor position when the clutch starts to transmit torque obtained by the second round of static self-learning test. Each static self-learning will obtain the execution motor position when the clutch starts to transmit torque. After multiple static self-learning, multiple execution motor positions when the clutch starts to transmit torque can be obtained, and then the maximum value max and the minimum value min are selected from them, and then the difference between the two is obtained, that is, max-min.

[0063] In the second round of static self-learning test, the position of the execution motor when the clutch starts to transmit torque during each static self-learning test can also be obtained (if the second round of static self-learning test includes 3 static self-learnings, KP_1, KP_2, and KP_3 need to be obtained, among which KP_1, KP_2, and KP_3 all represent the position of the execution motor when the clutch starts to transmit torque. The average value KP2 of the position of the execution motor when the clutch starts to transmit torque during the 3 static self-learning tests can be obtained based on KP_1, KP_2, and KP_3) and the average value of the position of the execution motor when the clutch is in the fully engaged position obtained by multiple static self-learnings (i.e., Lock2).

[0064] Step S40: obtaining a second round of static self-learning test results according to the first position, the second mechanical zero position, the second position and the first value.

[0065] In the above step S40, according to the first position, the second mechanical zero position, the second position and the first value, obtaining the second round of static self-learning test results may include: if the values ​​of Zero2, max-min and KP2-KP1 are all within the preset threshold range, then the second round of static self-learning test results are passed. If max-min is not within the preset threshold range, it is determined whether the poor consistency is caused by current jitter or other reasons.

[0066] In a possible implementation, after obtaining the second position of the execution motor during the second round of static self-learning, the transfer case offline detection method also includes testing the clutch in the transfer case, and the process may include: controlling the input shaft speed and output shaft speed of the transfer case and controlling the execution motor in the transfer case to start running from the preset second target position in the position control mode, obtaining the third position of the execution motor when the forward torque of the clutch in the transfer case meets the test requirements; and obtaining the test result of the clutch in the transfer case based on the third position and the second position. There are two purposes of this test: one is to verify whether the KP2 obtained by the second round of static self-learning is accurate, and the other is to determine whether the physical characteristics of the clutch are abnormal.

[0067] Among them, the test requirements include that the absolute value of the difference between the forward torque of the clutch in the transfer case and the preset first target torque is within the first threshold range, and the second target position can be set to KP2+Zero2-200°. The first target torque is set according to the torque transmitted by the clutch when the actuator motor is at KP2. The host computer needs to control the input shaft speed and output shaft speed of the transfer case within ±1rpm. When the input shaft speed and output shaft speed of the transfer case obtained by the host computer are stable, the test of the clutch in the transfer case is started.

[0068] The static self-learning test obtains the position of the actuator motor when the clutch starts to transmit torque, which is obtained by reading the actuator motor parameters and is a calculated value; while the clutch test in the transfer case obtains the position of the actuator motor when the clutch starts to transmit torque by continuously adjusting the clutch tension, which is a measured value.

[0069] The test result of the clutch in the transfer case obtained according to the third position (i.e., dynamic KP) and the second position includes: if the value of KP2-dynamic KP is within the preset threshold range, the test result of the clutch in the transfer case is passed. If the value of KP2-dynamic KP is not within the preset threshold range, it is judged that the clutch torque transmission characteristic does not meet the requirements. At this time, the clutch needs to be replaced and retested, and the faulty clutch is marked and retained for unified processing.

[0070] In one possible implementation, obtaining the third position of the execution motor when the forward torque of the clutch in the transfer case meets the test requirements includes: if the forward torque is greater than the first target torque, controlling the step size of the execution motor to gradually decrease, controlling the execution motor to maintain a preset second time length at each position, and obtaining the third position of the current execution motor when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range; or, if the forward torque is less than the first target torque, controlling the step size of the execution motor to gradually increase, controlling the execution motor to maintain a preset second time length at each position, and obtaining the third position of the current execution motor when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range.

[0071] The second duration in the above steps can be set according to test requirements. In addition to obtaining the third position of the execution motor when the forward torque of the clutch in the transfer case meets the test requirements, the forward torque of the clutch can also be obtained when the execution motor is in the third position.

[0072] In one possible implementation, after the second round of static self-learning test result characterization test is passed, the transfer case offline detection method also includes testing the torque transmission characteristics of the transfer case, and the specific process of testing the torque transmission characteristics of the transfer case includes: controlling the input shaft speed and output shaft speed of the transfer case, and the actuator motor in the transfer case to start running from a preset third target position according to a preset position gradient rule in a position control mode; obtaining the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time period; and obtaining the torque transmission characteristic test results of the transfer case according to each position of the actuator motor and the forward torque.

[0073] The purpose of the torque transmission characteristic test of the transfer case is to test the torque transmission accuracy of the transfer case. The preset position gradient rule includes multiple positions, and the control execution motor operates according to the preset position gradient rule. The third target position can be set to KP2+Zero2-500°. The third duration can be set according to the test needs.

[0074] The specific process of obtaining the test result of the torque transmission characteristic of the transfer case according to each position of the actuator motor and the forward torque includes: drawing a torque transmission characteristic curve according to the position of the actuator motor and the forward torque. If this curve is between the standard transfer case torque transmission characteristic curve and the standard transfer case torque transmission characteristic boundary curve, the test result of the torque transmission characteristic of the transfer case is that the test passed. It is also possible to draw a torque transmission characteristic curve of the transfer case based on KP2-dynamic KP translation. The translated torque transmission characteristic curve is used to indicate the torque transmission capability of the transfer case when the static self-learning error is ignored, and is used to judge the consistency of the torque transmission characteristic of the clutch. In one embodiment, the torque transmission characteristic curve image drawing can refer to Figure 3 As shown, Figure 3 This is only an example and the form is not limited thereto.

[0075] Among them, after the second round of static self-learning test result characterization test is passed, the transfer case offline detection method also includes testing the NVH (Noise, Vibration, and Harshness) performance of the transfer case. Testing the NVH performance of the transfer case may include: only testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions, or only testing the NVH performance of the transfer case under no speed difference and rising and falling speed torque transmission conditions. In some embodiments, testing the NVH performance of the transfer case may also include testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions, and testing the NVH performance of the transfer case under no speed difference and rising and falling speed torque transmission conditions. NVH performance is one of the important indicators for measuring automobile manufacturing quality, and is crucial to improving the driving experience of passengers.

[0076] In one possible implementation, the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions is tested by the following steps: controlling the input shaft speed and output shaft speed of the transfer case and controlling the actuator motor in the transfer case to run to a preset fourth target position in position control mode, and obtaining the target NVH measurement data of the transfer case during the entire process in which the actuator motor maintains the fourth target position for a preset fourth time period; based on the target NVH measurement data, obtaining the test results of the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions.

[0077] The input shaft speed, output shaft speed and fourth target position of the transfer case are calculated based on the working condition of the whole vehicle. The fourth duration can be set according to the test needs. When the target NVH measurement data obtained meets the NVH quality control plan, the NVH test result of the transfer case under the constant speed difference and constant speed torque transmission conditions is passed. NVH measurement data includes noise level, vibration data, sound spectrum analysis, order analysis, etc.

[0078] In one implementation mode, testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions also includes: obtaining the forward torque of the clutch in the transfer case; and determining whether the position of the actuator motor in the transfer case reaches a preset fourth target position based on the forward torque and a preset second target torque.

[0079] The second target torque is the torque transmitted by the clutch when the actuator motor in the transfer case runs to a preset fourth target position. The purpose of obtaining the forward torque and comparing it with the second target torque is to ensure that the actuator motor reaches the fourth target position accurately.

[0080] In one possible implementation, the NVH performance of the transfer case under the conditions of no speed differential and rising and falling speed torque transmission is tested by the following steps: controlling the actuator motor to run to a preset fifth target position under the position control mode; controlling the speed of the input shaft and the output shaft of the transfer case to increase the speed, and controlling the actuator motor to always be at the fifth target position under the position control mode during the speed increase process; controlling the speed of the input shaft and the output shaft of the transfer case to decrease the speed, and controlling the actuator motor to always be at the fifth target position under the position control mode during the speed decrease process; obtaining first NVH measurement data of the transfer case during the speed increase process, and obtaining second NVH measurement data of the transfer case during the speed decrease process; and obtaining test results of the NVH performance of the transfer case under the conditions of no speed differential and rising and falling speed torque transmission based on the first NVH measurement data and the second NVH measurement data.

[0081] Among them, the input shaft speed, output shaft speed and fifth target position of the transfer case are calculated according to the working condition of the whole vehicle. The time that the transfer case maintains in the fifth target position should be greater than the speed increase and decrease time of the input shaft and output shaft of the transfer case. When the first NVH measurement data and the second NVH measurement data obtained meet the NVH quality control plan, the NVH performance test result of the transfer case under the working condition of no speed difference and speed increase and decrease torque transmission is a passed test. Among them, the testing of the NVH performance of the transfer case under the working condition of no speed difference and speed increase and decrease torque transmission can include: first increase the speed and then decrease the speed, and first decrease the speed and then increase the speed.

[0082] In addition, after testing the NVH performance of the transfer case under conditions of no speed difference and speed-up and speed-down torque transmission, the actuator motor is controlled to restore it to its initial state, and then stops after maintaining it for a preset period of time.

[0083] In one possible implementation, after performing at least one of a clutch test, a torque transmission test, or an NVH performance test in the transfer case, the transfer case offline detection method also includes a third round of static self-learning test, and the specific process includes: the host computer controls the transfer case to perform a third round of static self-learning test by calling the static self-learning command of the controller in the transfer case, and the host computer obtains the result of the transfer case self-learning. When the transfer case self-learning is successful, the host computer obtains the third mechanical zero position (i.e., Zero3) and the second value of the motor executed during the third round of static self-learning; according to the third mechanical zero position and the second value, the third round of static self-learning test result of the transfer case is obtained.

[0084] The third round of static self-learning test includes multiple static self-learning, which can be 3 times. The second value is the difference between the maximum and minimum values ​​of the motor position when the clutch starts to transmit torque during the third round of static self-learning. Each static self-learning will obtain the motor position when the clutch starts to transmit torque. After multiple static self-learning, multiple motor positions can be obtained when the clutch starts to transmit torque. Then, the maximum and minimum values ​​are selected from them, and then the difference between the two is obtained, that is, the second value. Zero3 is the motor position when the clutch is in the non-torque limit position obtained by the third round of static self-learning. This position is the average value of the motor position when the clutch is in the non-torque limit position obtained by multiple static self-learning. In the third round of static self-learning test, the position of the motor when the clutch starts to transmit torque, the average value of the motor position when the clutch starts to transmit torque, that is, the fourth position (i.e., KP3), and the average value of the motor position when the clutch is fully engaged (i.e., Lock3) can also be obtained.

[0085] There are three purposes for obtaining KP3: one is to record the status of the transfer case offline inspection and accumulate data; the second is to determine the change in the position of the actuator motor when the clutch starts to transmit torque obtained during the third round of static self-learning and the second round of static self-learning. If the change is large, it means that the product is abnormal and needs to be intercepted; the third is to determine whether the performance of a batch of transfer cases is consistent.

[0086] The above-mentioned obtaining of the transfer case third wheel static self-learning test result according to the third mechanical zero position and the second value includes: if the third mechanical zero position and the second value are both within the preset threshold range, the transfer case third wheel static self-learning test result is the test passed.

[0087] In one implementation manner, the schematic diagram of the transfer case offline detection method provided in the embodiment of the present application can be as follows: Figure 4 As shown, it can be understood that Figure 4 The test steps in the schematic diagram shown can be omitted. In some possible implementations, the transfer case off-line detection method may include: ①+②, ①+③, ①+④, ①+②+③, ①+②+④, ①+③+④, ①+②+③+④, ①+②+⑤, ①+③+⑤, ①+④+⑤, ①+②+③+⑤, ①+②+④+⑤, ①+③+④+⑤ and ①+②+③+④+⑤.

[0088] like Figure 5 As shown, Figure 5 A schematic structural diagram of a transfer case offline detection system provided in an embodiment of the present application is shown.

[0089] The transfer case offline detection system includes a transfer case and a host computer. The host computer is connected to the transfer case, and is used to: control the transfer case to perform a first round of static self-learning test, obtain the first mechanical zero position and the first position of the execution motor in the transfer case during the first round of static self-learning, and obtain the first round of static self-learning test results according to the first mechanical zero position and the first position; if the first round of static self-learning test results indicate that the test has passed, control the transfer case to perform a running-in test; after the running-in test of the transfer case, control the transfer case to perform a second round of static self-learning test, obtain the second mechanical zero position, the second position and the first value of the execution motor during the second round of static self-learning; and obtain the second round of static self-learning test results according to the first position, the second mechanical zero position, the second position and the first value.

[0090] like Figure 6 As shown, Figure 6 FIG. 2 shows a schematic diagram of the structure of another transfer case offline detection system provided by an embodiment of the present application. Figure 6 The off-line detection system of the transfer case is described. The off-line detection system of the transfer case includes a transfer case, a drive test bench, a dynamometer and a host computer. In one embodiment, the drive test bench is connected to the host computer and the transfer case, respectively, and is used to control the input shaft speed of the transfer case. The dynamometer is connected to the host computer and the transfer case, respectively, and is used to control the output shaft speed of the transfer case. The host computer directly controls the drive test bench and the dynamometer. In another embodiment, the drive test bench and the dynamometer are connected to a controller, and the controller is connected to the host computer. In this embodiment, the host computer can control the drive test bench and the dynamometer through the controller. The principle is as follows. Figure 7 shown.

[0091] In one possible implementation, the drive test bench is used to control the input shaft speed of the transfer case; the dynamometer is used to control the output shaft speed of the transfer case; the host computer is also used to: after obtaining the second position of the execution motor during the second round of static self-learning, control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the execution motor in the transfer case to run from a preset second target position in a position control mode, and obtain the third position of the execution motor when the forward torque of the clutch in the transfer case meets the test requirements; according to the third position and the second position, obtain the test result of the clutch in the transfer case.

[0092] In one possible implementation, the drive test bench is used to control the input shaft speed of the transfer case; the dynamometer is used to control the output shaft speed of the transfer case; the host computer is also used to: after the second round of static self-learning test result characterization test is passed, control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the actuator motor in the transfer case to run from a preset third target position in a position control mode according to a preset position gradient rule; obtain the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time period; and obtain the torque transmission characteristic test results of the transfer case according to each position of the actuator motor and the forward torque.

[0093] In one possible implementation, the drive test bench is used to control the input shaft speed of the transfer case; the dynamometer is used to control the output shaft speed of the transfer case; the host computer is also used to: after the second round of static self-learning test result characterization test is passed, the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions is tested through the following steps: controlling the input shaft speed of the transfer case by the drive test bench, controlling the output shaft speed of the transfer case by the dynamometer, and controlling the actuator motor in the transfer case to run to a preset fourth target position in a position control mode, obtaining the target NVH measurement data of the transfer case during the whole process of the actuator motor maintaining the fourth target position for a preset fourth time length; according to the target NVH measurement data, the test results of the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions are obtained.

[0094] In one implementation, the host computer is further used to: obtain the forward torque of the clutch in the transfer case; and determine whether the position of the actuator motor in the transfer case reaches a preset fourth target position based on the forward torque and a preset second target torque.

[0095] In a possible implementation, the host computer is also used to: test the NVH performance of the transfer case under the conditions of no speed difference and rising and falling speed torque transmission through the following steps: control the actuator motor to run to a preset fifth target position under the position control mode; control the speed of the input shaft of the transfer case to increase by driving the test bench, and control the speed of the output shaft of the transfer case to increase by a dynamometer, and control the actuator motor to always be at the fifth target position under the position control mode during the speed increase process; control the speed of the input shaft of the transfer case to decrease by driving the test bench, and control the speed of the output shaft of the transfer case to decrease by a dynamometer, and control the actuator motor to always be at the fifth target position under the position control mode during the speed decrease process; obtain first NVH measurement data of the transfer case during the speed increase process and second NVH measurement data of the transfer case during the speed decrease process; and obtain test results of the NVH performance of the transfer case under the conditions of no speed difference and rising and falling speed torque transmission based on the first NVH measurement data and the second NVH measurement data.

[0096] In a possible implementation, the host computer is also used to: control the transfer case to perform a third round of static self-learning test, obtain the third mechanical zero position and the second value during the third round of static self-learning; and obtain the third round of static self-learning test results of the transfer case according to the third mechanical zero position and the second value.

[0097] The implementation principle and technical effects of the system embodiment are the same as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the system embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0098] like Figure 8 As shown, Figure 8 The schematic diagram of the structure of an electronic device 10 provided in an embodiment of the present application is shown. The electronic device 10 includes: a processor 11 and a memory 12.

[0099] It should be noted that Figure 8 The components and structures of the electronic device 10 shown are merely exemplary and non-limiting. The electronic device may also have other components and structures as required.

[0100] The processor 11, the memory 12, and other components that may appear in the electronic device 10 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, the processor 11, the memory 12, and other components that may appear may be electrically connected to each other via one or more communication buses or signal lines.

[0101] The memory 12 is used to store programs, for example, a program corresponding to the transfer case off-line detection method mentioned above is stored.

[0102] The processor 11 is used to execute the executable module stored in the memory 12 to execute the above-mentioned transfer case off-line detection method.

[0103] Of course, the method disclosed in any embodiment of the present application can be applied to the processor 11, or implemented by the processor 11.

[0104] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0105] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A transfer case off-line detection method, characterized in that: include: Controlling the transfer case to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an actuator motor in the transfer case during the first round of static self-learning, and obtaining a first round of static self-learning test result according to the first mechanical zero position and the first position, wherein the first position is a position of the actuator motor when the clutch in the transfer case starts to transmit torque; If the result of the first round of static self-learning test indicates that the test has passed, controlling the transfer case to perform a running-in test; After the transfer case is run-in tested, the transfer case is controlled to perform a second round of static self-learning test, and a second mechanical zero position, a second position and a first value of the actuator motor are obtained during the second round of static self-learning, wherein the second position is the position of the actuator motor when the clutch starts to transmit torque, and the first value is the difference between the maximum value and the minimum value of the actuator motor position when the clutch starts to transmit torque during the second round of static self-learning; A second round of static self-learning test results is obtained according to the first position, the second mechanical zero position, the second position and the first value.

2. The method according to claim 1, characterized in that The controlling the transfer case to perform a running-in test comprises: Control the input shaft speed and output shaft speed of the transfer case, control the actuator motor in the transfer case to run to a preset first target position under a position control mode, and control the actuator motor in the transfer case to maintain a preset first time period at the first target position.

3. The method according to claim 1, characterized in that After obtaining the second position of the execution motor during the second round of static self-learning, the method further includes: Controlling the input shaft speed and the output shaft speed of the transfer case and controlling the actuator motor in the transfer case to start running from a preset second target position in a position control mode, and obtaining a third position of the actuator motor when the forward torque of the clutch in the transfer case meets a test requirement, wherein the test requirement includes that an absolute value of a difference between the forward torque of the clutch in the transfer case and a preset first target torque is within a first threshold range; A test result of the clutch in the transfer case is obtained according to the third position and the second position.

4. The method according to claim 3, characterized in that: The step of obtaining the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirement includes: If the forward torque is greater than the first target torque, the step size of the actuator motor is controlled to gradually decrease, and the actuator motor is controlled to maintain a preset second time length at each position, and when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range, the third position of the current actuator motor is obtained; or, If the forward torque is less than the first target torque, the step size of the execution motor is controlled to gradually increase, and the execution motor is controlled to maintain a preset second time length at each position. When the absolute value of the difference between the forward torque and the first target torque is within a first threshold range, the third position of the current execution motor is obtained.

5. The method according to claim 1, characterized in that After the second round of static self-learning test result characterization test passes, the method further includes: Controlling the input shaft speed and the output shaft speed of the transfer case, and controlling the execution motor of the transfer case to start running from a preset third target position according to a preset position gradient rule in a position control mode, wherein the preset position gradient rule includes a plurality of positions; Obtaining the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time period; According to each position of the actuator motor and the forward torque, a test result of the torque transmission characteristic of the transfer case is obtained.

6. The method according to claim 1, characterized in that After the second round of static self-learning test result characterization test is passed, the method further includes: testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions by the following steps: Controlling the input shaft speed and the output shaft speed of the transfer case and controlling the actuator motor in the transfer case to run to a preset fourth target position in a position control mode, and obtaining target NVH measurement data of the transfer case during the entire process in which the actuator motor maintains the fourth target position for a preset fourth time period; According to the target NVH measurement data, a test result of testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions is obtained.

7. The method according to claim 6, characterized in that Testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions also includes: Obtaining the forward torque of the clutch in the transfer case; Based on the forward torque and the preset second target torque, it is determined whether the position of the actuator motor in the transfer case reaches a preset fourth target position, wherein the second target torque is the torque transmitted by the clutch when the actuator motor in the transfer case runs to the preset fourth target position.

8. The method according to claim 6, characterized in that The method further comprises: testing the NVH performance of the transfer case under the condition of no speed difference and up and down speed torque transmission by the following steps: Controlling the execution motor to run to a preset fifth target position in a position control mode; Controlling the rotation speed of the input shaft and the output shaft of the transfer case to increase the speed, and controlling the actuator motor to always be located at the fifth target position in the position control mode during the speed increase process; Controlling the rotation speed of the input shaft and the output shaft of the transfer case to reduce the speed, and controlling the actuator motor to always be located at the fifth target position in the position control mode during the reduction process; Acquire first NVH measurement data of the transfer case during a speed increase process, and acquire second NVH measurement data of the transfer case during a speed decrease process; Based on the first NVH measurement data and the second NVH measurement data, a test result of testing the NVH performance of the transfer case under the condition of no speed difference and increasing and decreasing speed torque transmission is obtained.

9. The method according to any one of claims 3 to 8, characterized in that: The method further comprises: Controlling the transfer case to perform a third round of static self-learning test, and obtaining a third mechanical zero position and a second value during the third round of static self-learning, wherein the second value is a difference between a maximum value and a minimum value of the execution motor position when the clutch starts to transmit torque during the third round of static self-learning; A static self-learning test result of the third wheel of the transfer case is obtained according to the third mechanical zero position and the second value.

10. A transfer case offline detection system, characterized in that: include: Transfer case; A host computer is connected to the transfer case and is used for: Controlling the transfer case to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an actuator motor in the transfer case during the first round of static self-learning, and obtaining a first round of static self-learning test result according to the first mechanical zero position and the first position, wherein the first position is a position of the actuator motor when the clutch in the transfer case starts to transmit torque; If the result of the first round of static self-learning test indicates that the test has passed, controlling the transfer case to perform a running-in test; After the transfer case is run-in tested, the transfer case is controlled to perform a second round of static self-learning test, and a second mechanical zero position, a second position and a first value of the actuator motor are obtained during the second round of static self-learning, wherein the second position is the position of the actuator motor when the clutch starts to transmit torque, and the first value is the difference between the maximum value and the minimum value of the actuator motor position when the clutch starts to transmit torque during the second round of static self-learning; A second round of static self-learning test results is obtained according to the first position, the second mechanical zero position, the second position and the first value.

11. The system according to claim 10, characterized in that The system further comprises: A drive frame for controlling the rotation speed of the input shaft of the transfer case, wherein the drive frame is connected to the host computer and the transfer case respectively; A dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; The host computer is used to control the input shaft speed of the transfer case through the drive test bench, control the output shaft speed of the transfer case through the dynamometer, and control the actuator motor in the transfer case to run to a preset first target position under a position control mode, and control the actuator motor in the transfer case to maintain a preset first time length at the first target position.

12. The system according to claim 10, characterized in that The system further comprises: A drive frame for controlling the rotation speed of the input shaft of the transfer case, wherein the drive frame is connected to the host computer and the transfer case respectively; A dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; The host computer is further used for: after obtaining the second position of the actuator motor during the second round of static self-learning, controlling the input shaft speed of the transfer case through the drive test bench, controlling the output shaft speed of the transfer case through the dynamometer, and controlling the actuator motor in the transfer case to start running from a preset second target position in a position control mode, and obtaining the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements, wherein the test requirements include that the absolute value of the difference between the forward torque of the clutch in the transfer case and the preset first target torque is within a first threshold range; A test result of the clutch in the transfer case is obtained according to the third position and the second position.

13. The system according to claim 10, characterized in that The system further comprises: A drive frame for controlling the rotation speed of the input shaft of the transfer case, wherein the drive frame is connected to the host computer and the transfer case respectively; A dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; The host computer is further used for: after the second round of static self-learning test result characterization test is passed, controlling the input shaft speed of the transfer case through the drive test bench, controlling the output shaft speed of the transfer case through the dynamometer, and controlling the execution motor in the transfer case to start running from a preset third target position according to a preset position gradient rule in a position control mode, wherein the preset position gradient rule includes multiple positions; Obtaining the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third time period; According to each position of the actuator motor and the forward torque, a test result of the torque transmission characteristic of the transfer case is obtained.

14. The system according to claim 10, characterized in that The system further comprises: A drive frame for controlling the rotation speed of the input shaft of the transfer case, wherein the drive frame is connected to the host computer and the transfer case respectively; A dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected to the host computer and the transfer case respectively; The host computer is further used to: after the second round of static self-learning test result characterization test is passed, test the NVH performance of the transfer case under the constant speed difference and constant speed torque transmission working conditions through the following steps: Controlling the input shaft speed of the transfer case by the drive test bench, controlling the output shaft speed of the transfer case by the dynamometer, and controlling the actuator motor in the transfer case to run to a preset fourth target position in a position control mode, and obtaining target NVH measurement data of the transfer case during the whole process of the actuator motor maintaining the fourth target position for a preset fourth time period; According to the target NVH measurement data, a test result of testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions is obtained.

15. The system according to claim 14, characterized in that The host computer is also used for: Obtaining the forward torque of the clutch in the transfer case; Based on the forward torque and the preset second target torque, it is determined whether the position of the actuator motor in the transfer case reaches a preset fourth target position, wherein the second target torque is the torque transmitted by the clutch when the actuator motor in the transfer case runs to the preset fourth target position.

16. The system according to claim 14, characterized in that The host computer is also used to test the NVH performance of the transfer case under the conditions of no speed difference and torque transmission with increasing and decreasing speed by the following steps: Controlling the execution motor to run to a preset fifth target position in a position control mode; The speed of the input shaft of the transfer case is increased by controlling the speed of the input shaft of the transfer case through the driving test bench, and the speed of the output shaft of the transfer case is increased by controlling the speed of the output shaft of the transfer case through the dynamometer, and during the speed increase process, the actuator motor is controlled to always be located at the fifth target position in the position control mode; The driving test bench is used to control the rotation speed of the input shaft of the transfer case to reduce the speed, and the dynamometer is used to control the rotation speed of the output shaft of the transfer case to reduce the speed, and during the speed reduction process, the actuator motor is controlled to always be located at the fifth target position in the position control mode; Acquire first NVH measurement data of the transfer case during a speed increase process and second NVH measurement data of the transfer case during a speed decrease process; Based on the first NVH measurement data and the second NVH measurement data, a test result of testing the NVH performance of the transfer case under the condition of no speed difference and increasing and decreasing speed torque transmission is obtained.

17. The system according to any one of claims 12 to 16, characterized in that: The host computer is also used for: Controlling the transfer case to perform a third round of static self-learning test, and obtaining a third mechanical zero position and a second value during the third round of static self-learning, wherein the second value is a difference between a maximum value and a minimum value of the execution motor position when the clutch starts to transmit torque during the third round of static self-learning; A static self-learning test result of the third wheel of the transfer case is obtained according to the third mechanical zero position and the second value.

18. An electronic device, characterized in that: include: A memory and a processor, wherein the memory is connected to the processor; The memory is used to store programs; The processor is used to call the program stored in the memory to execute the method according to any one of claims 1 to 9.

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