A kind of method, system and electronic equipment of detecting the output of transfer

Abstract

The present application relates to a kind of transfer lower line detection method, system and electronic equipment, belong to electronic technical field.The method includes: control transfer to carry out first round static self-learning test, obtain the first mechanical zero of the execution motor in transfer when first round static self-learning, and first position, according to first mechanical zero and first position, obtain first round static self-learning test result;If first round static self-learning test result represents test pass, control transfer to carry out running-in test;After running-in test is carried out to transfer, control transfer to carry out second round static self-learning test, obtain the second mechanical zero of execution motor, second position and first value when second round static self-learning;According to first position, second mechanical zero, second position and first value, obtain second round static self-learning test result.The present application can find potential fault problem by a series of tests, so as to take measures in advance, improve the performance and quality of product.

Description

Technical Field

[0001] This application belongs to the field of electronic technology, specifically relating to a transfer case offline detection method, system, and electronic equipment. Background Technology

[0002] Transfer case pre-production testing is a crucial step in ensuring that vehicles meet quality standards before leaving the factory. This process is essential for guaranteeing vehicle performance, safety, and reliability. However, current transfer case pre-production testing mainly involves loading the transfer case input and testing the output speed and torque. This primarily focuses on testing the transfer case's functionality, resulting in issues with poor product performance and low product quality. Summary of the Invention

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

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide a transfer case decommissioning detection method, comprising: 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 the actuator motor in the transfer case during the first round of static self-learning, obtaining a first round of static self-learning test result based on 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 indicates that the test is passed, controlling the transfer case to perform a break-in test; after the break-in test of the transfer case, controlling the transfer case to perform a second round of static self-learning test, 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 and minimum values ​​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 based on the first position, the second mechanical zero position, the second position, and the first value.

[0006] In the above embodiment, the transfer case is controlled to perform a first round of static self-learning test to obtain the first mechanical zero position and first position of the actuator during the first round of static self-learning, thus obtaining the result of the first round of static self-learning test. If the first round of static self-learning test passes, the transfer case is controlled to perform a break-in test. Then, the transfer case is controlled to perform a second round of static self-learning test to obtain the second mechanical zero position, second position, and first value of the actuator during the second round of static self-learning, thus obtaining the result of the second round of static self-learning test. Because the actuator controls the clutch of the transfer case through the transmission mechanism, the first round of static self-learning test can ensure that the actuator accurately places the clutch in the correct starting position, providing accurate information for subsequent operations. The reference point is as follows: After the first round of static self-learning, a transfer case break-in test is conducted to help break in the clutch assembly, stabilize its torque transmission characteristics, reduce wear during initial use, improve clutch lifespan and reliability, and optimize clutch performance, ensuring smoother operation and reducing malfunctions caused by insufficient break-in. After the clutch break-in test, a second round of static self-learning test is conducted to ensure that the clutch position remains accurate after break-in, meeting the product's requirements for precise position control. This series of tests helps improve the transfer case's responsiveness and helps identify potential faults, allowing for proactive measures to improve product performance and quality.

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

[0008] In the above embodiments, 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 the first target position for a preset first duration, a break-in test is performed on the transfer case. This ensures that each component of the clutch can be fully broken in before actual use, improves 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, break-in helps to reduce early wear of the clutch components, which can extend the service life of the clutch and thus improve the quality of the product.

[0009] In conjunction with the first aspect of the embodiment, in one possible implementation, 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 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 position control mode; 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 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 embodiments, by controlling the input shaft speed and 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 position control mode, the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements is obtained. Based on the third position and the second position, the test result of the clutch in the transfer case is obtained. By controlling the operation of the actuator motor to continuously adjust the clutch clamping degree, the position of the actuator motor when the clutch in the transfer case starts to transmit torque is actually measured. This not only verifies 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 determines whether there are any abnormalities in the physical performance of the clutch. This helps to discover potential problems in advance, thereby taking measures in advance to improve the quality and performance of the product.

[0011] In conjunction with the first aspect of the embodiment, in one possible implementation, obtaining 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 duration at each position, and obtaining the current third position of the actuator 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 actuator motor to gradually increase, controlling the actuator motor to maintain a preset second duration at each position, and obtaining the current third position of the actuator motor when the absolute value of the difference between the forward torque and the first target torque is within a first threshold range.

[0012] In the above embodiments, by determining the magnitude relationship between the forward torque and the first target torque, the actuator motor is controlled to perform corresponding actions based on the magnitude relationship between the forward torque and the first target torque. 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 actuator motor is obtained, thereby achieving the purpose of precisely controlling the position of the actuator motor. This ensures that the difference between the torque transmitted by the clutch and the first target torque is within the error range, improving the accuracy of the clutch test results in the transfer case, optimizing the clutch performance, and thus improving the quality of the product.

[0013] In conjunction with the first aspect of the embodiment, in one possible implementation, after the second round of static self-learning test result characterization test is passed, the method further includes: controlling the input shaft speed and output shaft speed of the transfer case, and having the actuator motor in the transfer case start running from a preset third target position according to a preset position gradient rule in 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 duration; and obtaining the torque transmission characteristic test result of the transfer case based on each position of the actuator motor and the forward torque.

[0014] In the above embodiments, by controlling the input shaft speed and output shaft speed of the transfer case, and by having the actuator motor in the transfer case start running from a preset third target position according to a preset position gradient rule in position control mode, the forward torque of the clutch in the transfer case is obtained when the actuator motor is continuously running at each position for a preset third duration. Based on each position of the actuator motor and the forward torque, the torque transmission characteristic test results of the transfer case are obtained. Testing the torque transmission characteristics of the transfer case can evaluate its torque transmission capability, ensure that it meets actual use requirements, and also provide a comprehensive understanding of the torque transmission performance of the transfer case, providing data support for improving product performance. The results of the torque transmission characteristic test of the transfer case can also be used to optimize the transfer case, thereby improving the vehicle's driving performance and stability.

[0015] In conjunction with the first aspect of the embodiment, in one possible implementation, 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 in position control mode, obtaining the target NVH measurement data of the transfer case during the entire process of the actuator motor maintaining the fourth target position for a preset fourth duration; and obtaining the test result of testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions based on the target NVH measurement data.

[0016] In the above embodiments, 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 position control mode, the target NVH measurement data of the transfer case is obtained during the entire process of the actuator motor maintaining the fourth target position for a preset fourth duration. Based on the target NVH measurement data, the NVH performance test results of the transfer case under constant speed difference and constant speed torque transmission conditions are obtained. Testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions can identify and optimize the performance of the transfer case, reduce noise and vibration, and at the same time help to diagnose and locate possible fault sources, thereby taking 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 reaches the expected performance standards during development and production, and improve product performance.

[0017] In conjunction with the first aspect of the embodiment, in one possible implementation, testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions further 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 has reached 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 reaches the preset fourth target position.

[0018] In the above embodiments, the current forward torque of the clutch in the transfer case is obtained; based on 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 test conditions of constant speed difference and constant speed torque transmission, thereby improving the accuracy of the NVH performance test results of the transfer case under constant speed difference and constant speed torque transmission conditions.

[0019] In conjunction with the first aspect of the embodiment, in one possible implementation, the method further includes: testing the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed torque transmission through the following steps: controlling the actuator motor to run to a preset fifth target position in position control mode; controlling the speed of the input shaft and output shaft of the transfer case to increase speed, while controlling the actuator motor to always be at the fifth target position in position control mode during the speed increase process; controlling the speed of the input shaft and output shaft of the transfer case to decrease speed, while controlling the actuator motor to always be at the fifth target position in position control mode during the speed decrease process; acquiring first NVH measurement data of the transfer case during the speed increase process, and acquiring second NVH measurement data of the transfer case during the speed decrease process; and obtaining test results for testing the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing 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 position control mode, the rotational speeds of the input and output shafts of the transfer case are first increased and then decreased. The first and second NVH measurement data of the transfer case are acquired during the acceleration and deceleration process, and the NVH performance test results of the transfer case under the condition of no speed difference and acceleration / deceleration torque transmission are obtained. Testing the NVH performance of the transfer case under the condition of no speed difference and acceleration / deceleration torque transmission can evaluate the NVH performance of the transfer case at different speeds, which helps to identify possible noise and vibration sources and thus 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, ensuring that the product reaches the expected performance standards during development and production, and improving the product performance.

[0021] In conjunction with the first aspect of the embodiment, in one possible implementation, the method further 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 motor position when the clutch starts to transmit torque during the third round of static self-learning; and obtaining the third round of static self-learning test result of the transfer case based on the third mechanical zero position and the second value.

[0022] In the above embodiment, the transfer case undergoes a third round of static self-learning test to obtain the third mechanical zero position and the second value during the third round of static self-learning. Based on the third mechanical zero position and the second value, the result of the third round of static self-learning test of the transfer case is obtained. By performing the third round of static self-learning, the stability of the transfer case can be improved, ensuring that the transfer case can still work stably and meet all performance standards and requirements after undergoing 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 serve as part of the diagnostic process to help identify and resolve existing faults, thereby improving product quality.

[0023] Secondly, this application provides a transfer case decommissioning detection system, comprising: a transfer case; and a host computer connected to the transfer case, the host computer being configured 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 actuator motor in the transfer case during the first round of static self-learning, obtain the first round of static self-learning test result based on 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 begins to transmit torque; if the first round of static self-learning test result indicates that the test is passed, control the transfer case to perform a break-in test; after the break-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 actuator motor during the second round of static self-learning, wherein the second position is the position of the actuator motor when the clutch begins to transmit torque, and the first value is the difference between the maximum and minimum values ​​of the actuator motor position when the clutch begins to transmit torque during the second round of static self-learning; and obtain the second round of static self-learning test result based on the first position, the second mechanical zero position, the second position, and the first value.

[0024] In conjunction with the second aspect of the embodiment, in one possible implementation, 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 used to control the input shaft speed of the transfer case via the drive test bench, control the output shaft speed of the transfer case via the dynamometer, control the actuator motor in the transfer case to run to a preset first target position under position control mode, and control the actuator motor in the transfer case to maintain the first target position at a preset first duration.

[0025] In conjunction with the second aspect embodiment, in one possible implementation, 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 configured to: after acquiring the second position of the actuator motor during the second round of static self-learning, control the input shaft speed of the transfer case via the drive test bench, control the output shaft speed of the transfer case via the dynamometer, and control the actuator motor in the transfer case to start running from a preset second target position in position control mode, acquire 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 within a first threshold range; and obtain the test result of the clutch in the transfer case based on the third position and the second position.

[0026] In conjunction with the second aspect of the embodiment, in one possible implementation, 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 configured 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 in position control mode according to a preset position gradient rule, 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 duration; and obtain the torque transmission characteristic test result of the transfer case based on each position of the actuator motor and the forward torque.

[0027] In conjunction with the second aspect embodiment, in one possible implementation, 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 configured to: after the second round of static self-learning test result characterization test is passed, perform the following steps to test the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions: 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 fourth target position in position control mode, and obtain the target NVH measurement data of the transfer case during the entire process of the actuator motor maintaining the fourth target position for a preset fourth duration; based on the target NVH measurement data, obtain the test result of testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions.

[0028] In conjunction with the second aspect embodiment, in one possible implementation, the host computer is further configured to: acquire the forward torque of the clutch in the transfer case; and determine whether the position of the actuator motor in the transfer case has reached 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 reaches the preset fourth target position.

[0029] In conjunction with the second aspect of the embodiment, in one possible implementation, the host computer is further configured to: test the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed transmission torque through the following steps: controlling the actuator motor to run to a preset fifth target position in position control mode; controlling the speed of the input shaft of the transfer case to increase speed through the drive test bench and controlling the speed of the output shaft of the transfer case to increase speed through the dynamometer, while controlling the actuator motor to always be at the fifth target position in position control mode during the speed increase process; controlling the speed of the input shaft of the transfer case to decrease speed through the drive test bench and controlling the speed of the output shaft of the transfer case to decrease speed through the dynamometer, while controlling the actuator motor to always be at the fifth target position in position control mode during the speed decrease process; acquiring 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 obtaining test results for testing the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed transmission torque through the first NVH measurement data and the second NVH measurement data.

[0030] In conjunction with the second aspect of the embodiment, in one possible implementation, the host computer is further configured to: control the transfer case to perform a third round of static self-learning test, obtain 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 motor position when the clutch starts to transmit torque during the third round of static self-learning; and obtain the result of the third round of static self-learning test of the transfer case based on the third mechanical zero position and the second value.

[0031] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor, the memory being connected to the processor; the memory being used to store a program; the processor being used to invoke the program stored in the memory to execute the method provided by any of the embodiments of the first aspect and / or in combination with the embodiments of the first aspect.

[0032] Other features and advantages of this application will be set forth in the following description. The objectives and other advantages of this application can be realized and obtained through the structures specifically pointed out in the written description and the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of this application will become clearer through the accompanying drawings.

[0034] Figure 1 A schematic flowchart of a transfer case offline detection method provided in an embodiment of this application is shown.

[0035] Figure 2 This diagram illustrates the time, position, time, and current of the actuator motor during the first round of static self-learning test of a transfer case provided in an embodiment of this application.

[0036] Figure 3 This diagram illustrates a torque transmission characteristic curve of a transfer case provided in an embodiment of this application.

[0037] Figure 4 This diagram illustrates the principle of a transfer case offline detection method provided in an embodiment of this application.

[0038] Figure 5 A schematic diagram of the first structure of the transfer case offline detection system provided in this application embodiment is shown.

[0039] Figure 6A schematic diagram of a second structure of the transfer case offline detection system provided in an embodiment of this application is shown.

[0040] Figure 7 A schematic diagram of a third structure of the transfer case offline detection system provided in this application embodiment is shown.

[0041] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following embodiments are provided as examples to more clearly illustrate the technical solutions of this application, and should not be used to limit the scope of protection of this application. Those skilled in the art will understand that, without conflict, the following embodiments and features can be combined with each other.

[0043] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, relational terms such as "first," "second," etc., in the description of this application are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one…" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0045] This application provides a transfer case off-line testing method. The method involves controlling the transfer case to perform a first round of static self-learning testing. After passing the first round of static self-learning testing, the transfer case undergoes a break-in test, followed by a second round of static self-learning testing. The first round of static self-learning testing ensures the transfer case can accurately identify its initial position. The break-in test allows the various components of the transfer case to reach their optimal fit and helps identify potential problems, enabling early adjustment and repair. The second round of static self-learning testing confirms whether the position and performance of the transfer case after break-in meet expectations, ensuring 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] To facilitate understanding, the following will be combined with... Figure 1 The flowchart shown illustrates the principle of the transfer case failure detection method provided in this application embodiment. The execution entity of the transfer case failure detection method shown in this application embodiment can be an electronic device or a host computer, etc. The following example uses a host computer as an example.

[0047] Step S10: Control the transfer case to perform the 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 results of the first round of static self-learning test based on the first mechanical zero position and the first position.

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

[0049] In step S10 above, 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. The host computer obtains the result of the transfer case's self-learning, which is reflected by the EOL LearnStage feedback value. An EOL LearnStage feedback value of 03 indicates successful self-learning, and an EOL LearnStage feedback value of 04 indicates self-learning failure. 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] The first round of static self-learning testing may include multiple static self-learning processes, up to three times. Zero1 represents the actuator motor position when the clutch is in a non-torque transmission limit position. This position is the average of the actuator motor positions obtained from multiple static self-learning processes, and it depends on the position of the ball cam, a key component inside the transfer case, during assembly. KP1 represents the actuator motor position when the clutch in the transfer case begins to transmit torque. This position is the average of the actuator motor positions obtained from multiple static self-learning processes when the clutch begins to transmit torque. KP1 depends on the thickness of the shims when the transfer case is assembled onto the test bench.

[0051] During the transfer case's off-line testing, the transfer case must be assembled onto a test bench before testing can begin. A crucial step in assembling the transfer case onto the test bench is adjusting the shims. This adjustment ensures that gear clearance, bearing preload, and other parameters meet design requirements. The methods for assembling the transfer case onto the test bench and ensuring these parameters are met through shim adjustment are existing technologies and will not be discussed further here.

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

[0053] In step S10 above, obtaining the first round of static self-learning test results based on Zero1 and KP1 can include: if both Zero1 and KP1 are within the preset threshold range, the first static self-learning test passes. If either Zero1 or KP1 is outside the preset threshold range, and this is due to an abnormality in the shim selection process when the transfer case is assembled onto the test bench, the test program should be exited, and the shims should be reselected and adjusted before retesting.

[0054] The purpose of step S10 is to test the consistency of the transfer case assembly, the consistency of the shim selection, and the consistency of the clutch specifications, in order to control product quality. In addition, a graph can be plotted based on the time of the first round of static self-learning tests and the position, time, and current of the actuator motor. The graph plotting can be found in [reference needed]. Figure 2 As shown, Figure 2 This is merely an example; the format of the drawn image is not limited to this, where, Figure 2 In the first round of static self-learning test, Mot represents the position curve of the motor, and Iq current represents the current curve of the motor during the first round of static self-learning test.

[0055] Step S20: If the first round of static self-learning test results characterization test is passed, control the transfer case to perform a break-in test.

[0056] The purpose of step S20 is to bring the torque transmission characteristics of the clutch to a stable state.

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

[0058] In one possible implementation, as described in this embodiment, the input and output shaft speeds of the transfer case can be controlled by a host computer controlling the input shaft speed via a control drive test bench and the output shaft speed via a control dynamometer. The drive test bench simulates the transmission of a real vehicle, providing power to the transfer case; the dynamometer controls the speed of the forward output shaft of the transfer case. In another possible implementation, the input and output shaft speeds 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 the clutch transmits a torque of 600 Nm when the actuator is in this position. The first duration can be configured according to testing needs. After one break-in test, a period of time must be waited for the clutch to cool down before the second break-in test can be performed. If the break-in is continued, 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 to obtain the second mechanical zero position, second position and first value of the motor during the second round of static self-learning.

[0061] In step S30 above, the host computer controls the transfer case to perform the 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's self-learning. When the transfer case's 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] The second round of static self-learning testing includes multiple static self-learning sessions, up to three times. Zero2 represents the actuator motor position when the clutch is in a non-torque transmission limit position; this position is the average of the actuator motor positions obtained from multiple static self-learning sessions. KP2 represents the actuator motor position when the clutch begins to transmit torque during the second round of static self-learning; this position is the average of the actuator motor's position relative to the mechanical zero position obtained from multiple static self-learning sessions. max-min is the difference between the maximum and minimum values ​​of the actuator motor position when the clutch begins to transmit torque during the second round of static self-learning, used to determine the consistency of the actuator motor positions obtained from the second round of static self-learning testing. Each static self-learning session acquires the actuator motor position when the clutch begins to transmit torque. After multiple static self-learning sessions, multiple actuator motor positions are obtained. The maximum value (max) and minimum value (min) are then selected, and their difference (max-min) is calculated.

[0063] In the second round of static self-learning tests, the position of the actuator motor when the clutch starts to transmit torque can also be obtained for each static self-learning test (if the second round of static self-learning tests includes 3 static self-learning tests, then KP_1, KP_2, and KP_3 need to be obtained, where KP_1, KP_2, and KP_3 all represent the position of the actuator motor when the clutch starts to transmit torque, and the average value KP2 of the position of the actuator motor when the clutch starts to transmit torque during the 3 static self-learning tests can be obtained from KP_1, KP_2, and KP_3) as well as the average value of the actuator motor position when the clutch is in the fully engaged position obtained from multiple static self-learning tests (i.e., Lock2).

[0064] Step S40: Based on the first position, the second mechanical zero position, the second position, and the first value, obtain the results of the second round of static self-learning test.

[0065] In step S40 above, obtaining the second round of static self-learning test results based on the first position, the second mechanical zero position, the second position, and the first value 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 considered passed. If max-min is not within the preset threshold range, it is determined whether the poor consistency is due to reasons such as current fluctuations.

[0066] In one possible implementation, after obtaining the second position of the actuator motor during the second round of static self-learning, the transfer case offline detection method further includes testing the clutch in the transfer case. This process 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 start running from a preset second target position in position control mode; obtaining the third position of the actuator 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. This test has two purposes: first, to verify the accuracy of KP2 obtained during the second round of static self-learning; and second, to determine whether the physical characteristics of the clutch are abnormal.

[0067] 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 the second target position can be set to KP2+Zero2-200°. The first target torque is set based on the torque transmitted by the clutch when the actuator is located at KP2. The host computer needs to control the input shaft speed and output shaft speed of the transfer case within ±1 rpm. Once 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 begins.

[0068] The position of the actuator motor when the clutch starts transmitting torque, obtained from the static self-learning test, 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 transmitting torque by continuously adjusting the clutch clamping degree and is a measured value.

[0069] The test results for the clutch in the transfer case, obtained based on the third position (i.e., dynamic KP) and the second position, are as follows: If the value of KP2 - dynamic KP is within the preset threshold range, the test result for the clutch in the transfer case is considered passed. If the value of KP2 - dynamic KP is not within the preset threshold range, it is determined that the clutch torque transmission characteristics do not meet the requirements. In this case, the clutch needs to be replaced and retested. The faulty clutch is marked and retained for unified processing.

[0070] In one possible implementation, obtaining 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 each position for a preset second duration, and obtaining the third position of the current actuator 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 actuator motor to gradually increase, controlling the actuator motor to maintain each position for a preset second duration, and obtaining the third position of the current actuator 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 the test requirements. In addition to obtaining the third position of the actuator 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 actuator motor is in the third position.

[0072] In one possible implementation, after the second round of static self-learning test results characterization test is passed, the transfer case offline detection method further includes testing the transfer case's torque transmission characteristics. The specific process for testing the transfer case's torque transmission characteristics includes: controlling the input shaft speed and output shaft speed of the transfer case, and having the actuator motor in the transfer case start running from a preset third target position according to a preset position gradient rule in 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 duration; and obtaining the test results of the transfer case's torque transmission characteristics based on each position of the actuator motor and the forward torque.

[0073] The purpose of the above-mentioned transfer case torque transmission characteristic test is to test the transfer case torque transmission accuracy. The preset position gradient rule includes multiple positions, and the control actuator 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 requirements.

[0074] The specific process for obtaining the transfer case's torque transmission characteristic test results based on each position of the actuator motor and the forward transmission torque includes: plotting a torque transmission characteristic curve based on the actuator motor's position and forward transmission torque; if this curve lies between the standard transfer case torque transmission characteristic curve and the standard transfer case torque transmission characteristic boundary curve, then the transfer case's torque transmission characteristic test result is considered passed. Alternatively, a torque transmission characteristic curve of the transfer case after KP2-dynamic KP translation can be plotted. This translated torque transmission characteristic curve represents the transfer case's torque transmission capability when static self-learning error is ignored, and is used to determine the consistency of the clutch's torque transmission characteristics. In one embodiment, the plotting of the torque transmission characteristic curve image can be found in [reference needed]. Figure 3 As shown, Figure 3 This is merely an example, and its form is not limited to this.

[0075] The transfer case off-line testing method, following the successful completion of the second round of static self-learning test characterization, also includes testing the NVH (Noise, Vibration, and Harshness) performance of the transfer case. This testing can include: testing only 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 variable speed torque transmission conditions. In some embodiments, the NVH performance testing can also include testing both the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions, and the NVH performance of the transfer case under no speed difference and variable speed torque transmission conditions. NVH performance is one of the important indicators for measuring the quality of automobile manufacturing and is crucial for improving the passenger's driving experience.

[0076] In one possible implementation, 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 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 acquiring the target NVH measurement data of the transfer case during the entire process of the actuator motor maintaining the fourth target position for a preset fourth duration; 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 mentioned above are calculated based on the vehicle's operating conditions. The fourth duration can be set according to testing needs. When the acquired target NVH measurement data meets the NVH quality control scheme, the NVH test result of the transfer case under constant speed difference and constant speed torque transmission conditions is considered passed. NVH measurement data includes noise level, vibration data, sound spectrum analysis, order analysis, etc.

[0078] In one embodiment, testing the NVH performance of the transfer case under constant speed difference and constant speed torque transmission conditions further 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 has reached a preset fourth target position based on the forward torque and a preset second target torque.

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

[0080] In one possible implementation, the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed torque transmission is tested through the following steps: controlling the actuator motor to run to a preset fifth target position in position control mode; controlling the speed of the input and output shafts of the transfer case to increase speed, while keeping the actuator motor at the fifth target position in position control mode during the speed increase process; controlling the speed of the input and output shafts of the transfer case to decrease speed, while keeping the actuator motor at the fifth target position in position control mode during the speed decrease process; acquiring the first NVH measurement data of the transfer case during the speed increase process, and acquiring the second NVH measurement data of the transfer case during the speed decrease process; and obtaining the test results of the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed torque transmission based on the first and second NVH measurement data.

[0081] The input shaft speed, output shaft speed, and fifth target position of the transfer case are calculated based on the vehicle's operating conditions. The time the transfer case maintains the fifth target position should be greater than the acceleration / deceleration time of the input and output shafts. When the acquired first and second NVH measurement data meet the NVH quality control scheme, the NVH performance test result of the transfer case under the no-speed-difference, acceleration / deceleration torque transmission condition is considered passed. The NVH performance test of the transfer case under the no-speed-difference, acceleration / deceleration torque transmission condition can include: accelerating first and then decelerating, or decelerating first and then accelerating.

[0082] In addition, after testing the NVH performance of the transfer case under conditions of no speed difference and speed-to-torque transmission, the actuator motor is controlled to return to its initial state, and after maintaining this state for a preset time, the machine is stopped.

[0083] In one possible implementation, after performing at least one of the following tests in the transfer case: clutch test, torque transmission test, or NVH performance test, the transfer case offline detection method further includes a third round of static self-learning test. 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; 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; based on the third mechanical zero position and the second value, the result of the third round of static self-learning test of the transfer case is obtained.

[0084] The aforementioned third round of static self-learning test includes multiple static self-learning sessions, up to three times. The second value is the difference between the maximum and minimum values ​​of the motor position when the clutch begins to transmit torque during the third round of static self-learning. Each static self-learning session acquires the motor position when the clutch begins to transmit torque. After multiple static self-learning sessions, multiple motor positions when the clutch begins to transmit torque can be obtained. Then, the maximum and minimum values ​​are selected, and the difference between them is obtained, which is the second value. Zero3 is the motor position when the clutch is in a non-torque transmission limit position, obtained from the third round of static self-learning. This position is the average value of the motor positions when the clutch is in a non-torque transmission limit position obtained from multiple static self-learning sessions. During the third round of static self-learning test, the motor position when the clutch begins to transmit torque each time, the average value of the motor positions when the clutch begins to transmit torque multiple times (i.e., the fourth position, KP3), and the average value of the motor positions when the clutch is fully engaged multiple times (i.e., Lock3) can also be obtained.

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

[0086] The results of the third round of static self-learning test of the transfer case, based on the third mechanical zero position and the second value, include: if both the third mechanical zero position and the second value are within the preset threshold range, the result of the third round of static self-learning test of the transfer case is that the test is passed.

[0087] In one implementation, the schematic diagram of the transfer case decommissioning detection method provided in this application embodiment can be as follows: Figure 4 As shown, it is understandable that Figure 4 The test steps in the schematic diagram shown can be omitted. In some possible implementations, the transfer case offline 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 diagram of a transfer case offline detection system provided in an embodiment of this application is shown.

[0089] The transfer case shutdown detection system includes a transfer case and a host computer. The host computer, connected to the transfer case, is used to: control the transfer case to perform a first round of static self-learning testing, acquiring the first mechanical zero position and first position of the actuator motor during the first round of static self-learning; and obtain the first round of static self-learning test results based on the first mechanical zero position and first position. If the first round of static self-learning test results indicate a passed test, the system controls the transfer case to perform a break-in test. After the break-in test, the system controls the transfer case to perform a second round of static self-learning testing, acquiring the second mechanical zero position, second position, and first value of the actuator motor during the second round of static self-learning; and obtain the second round of static self-learning test results based on the first position, second mechanical zero position, second position, and first value.

[0090] like Figure 6 As shown, Figure 6 This illustration shows a structural schematic diagram of another transfer case offline detection system provided in an embodiment of this application. (Combined with...) Figure 6 The off-line testing system for the transfer case is described below. The system includes the transfer case, a drive test bench, a dynamometer, and a host computer. In one embodiment, the drive test bench is connected to both the host computer and the transfer case, and is used to control the input shaft speed of the transfer case. The dynamometer is connected to both the host computer and the transfer case, 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 controls the drive test bench and the dynamometer through the controller, and the principle is as follows: Figure 7 As shown.

[0091] In one possible implementation, a drive bench is used to control the input shaft speed of the transfer case; a dynamometer is used to control the output shaft speed of the transfer case; and a host computer is further used to: after acquiring the second position of the actuator motor during the second round of static self-learning, control the input shaft speed of the transfer case via the drive bench, control the output shaft speed of the transfer case via the dynamometer, and control the actuator motor in the transfer case to start running from a preset second target position in position control mode, acquire the third position of the actuator motor when the forward torque of the clutch in the transfer case meets the test requirements; and obtain the test result of the clutch in the transfer case based on the third position and the second position.

[0092] In one possible implementation, a drive bench is used to control the input shaft speed of the transfer case; a dynamometer is used to control the output shaft speed of the transfer case; and a 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 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 position control mode; obtain the forward torque of the clutch in the transfer case when the actuator motor is in each position for a preset third duration; and obtain the torque transmission characteristic test result of the transfer case based on each position of the actuator motor and the forward torque.

[0093] In one possible implementation, a drive test bench is used to control the input shaft speed of the transfer case; a dynamometer is used to control the output shaft speed of the transfer case; and a 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 constant speed difference and constant speed torque transmission conditions through the following steps: 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 fourth target position in position control mode, and obtain the target NVH measurement data of the transfer case during the entire process of the actuator motor maintaining the fourth target position for a preset fourth duration; based on the target NVH measurement data, obtain the test results of the NVH performance test of the transfer case under constant speed difference and constant speed torque transmission conditions.

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

[0095] In one possible implementation, the host computer is further configured to: test the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed and torque transmission through the following steps: controlling the actuator motor to run to a preset fifth target position in position control mode; controlling the speed of the input shaft of the transfer case to increase speed through a drive test bench and controlling the speed of the output shaft of the transfer case to increase speed through a dynamometer, while controlling the actuator motor to remain at the fifth target position in position control mode during the speed increase process; controlling the speed of the input shaft of the transfer case to decrease speed through a drive test bench and controlling the speed of the output shaft of the transfer case to decrease speed through a dynamometer, while controlling the actuator motor to remain at the fifth target position in position control mode during the speed decrease process; acquiring the first NVH measurement data of the transfer case during the speed increase process and the second NVH measurement data of the transfer case during the speed decrease process; and obtaining the test results of the NVH performance of the transfer case under conditions of no speed difference and increasing / decreasing speed and torque transmission based on the first NVH measurement data and the second NVH measurement data.

[0096] In one possible implementation, the host computer is further configured 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 result of the third round of static self-learning test of the transfer case based on 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 brevity, any parts not mentioned in the system embodiment can be referred to the corresponding content in the aforementioned method embodiment.

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

[0099] It should be noted that Figure 8 The components and structure of the electronic device 10 shown are merely exemplary and not limiting; the electronic device may have other components and structures as needed.

[0100] The processor 11, memory 12, and other components that may be present in the electronic device 10 are electrically connected to each other, directly or indirectly, to enable data transmission or interaction. For example, the processor 11, memory 12, and other components 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, such as the program corresponding to the transfer case offline detection method mentioned above.

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

[0103] Of course, the methods disclosed in any embodiment of this 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, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

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

[0106] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of detecting a drop-out of a transfer case, characterized by, The method comprises: controlling the transfer to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an executing motor in the transfer 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 executing motor when a clutch in the transfer starts to transmit torque; if the first round of static self-learning test result indicates that the test is passed, controlling the transfer to perform a running-in test; after the running-in test of the transfer, controlling the transfer to perform a second round of static self-learning test, obtaining a second mechanical zero position, a second position and a first value of the executing motor during the second round of static self-learning, wherein the second position is the position of the executing 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 position of the executing motor 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.

2. The method of claim 1, wherein, The control of the transfer to perform the running-in test comprises: controlling the rotational speed of the input shaft and the output shaft of the transfer, and controlling the executing motor in the transfer to run to a preset first target position under position control mode, and controlling the executing motor in the transfer to maintain at the first target position for a preset first time length.

3. The method of claim 1, wherein, After obtaining the second position of the executing motor during the second round of static self-learning, the method further comprises: controlling the rotational speed of the input shaft and the output shaft of the transfer, and controlling the executing motor in the transfer to run from a preset second target position under position control mode, and obtaining a third position of the executing motor when the torque transmitted by the clutch in the transfer meets a test requirement, wherein the test requirement comprises that the absolute value of the difference between the torque transmitted by the clutch in the transfer and a preset first target torque is within a first threshold range; obtaining a test result of the clutch in the transfer according to the third position and the second position.

4. The method of claim 3, wherein, The obtaining of the third position of the executing motor when the torque transmitted by the clutch in the transfer meets the test requirement comprises: if the torque transmitted by the clutch is greater than the first target torque, gradually reducing the step of the executing motor, controlling the executing motor to maintain at each position for a preset second time length, and obtaining the third position of the executing motor when the absolute value of the difference between the torque transmitted by the clutch and the first target torque is within the first threshold range; or if the torque transmitted by the clutch is less than the first target torque, gradually increasing the step of the executing motor, controlling the executing motor to maintain at each position for a preset second time length, and obtaining the third position of the executing motor when the absolute value of the difference between the torque transmitted by the clutch and the first target torque is within the first threshold range.

5. The method of claim 1, wherein, After the second round of static self-learning test result indicates that the test is passed, the method further comprises: controlling the input shaft rotating speed and the output shaft rotating speed of the transfer, and controlling the executing motor in the transfer to run from a preset third target position according to a preset position gradient rule in a position control mode, wherein the preset position gradient rule comprises a plurality of positions; acquiring the front transmission torque of the clutch in the transfer when the executing motor stays at each position for a preset third time length; obtaining the transmission torque characteristic test result of the transfer according to each position of the executing motor and the front transmission torque.

6. The method of claim 1, wherein, After the second round of static self-learning test result represents that the test is passed, the method further comprises: testing the NVH performance of the transfer under the constant speed difference and constant rotating speed transmission torque working condition by the following steps: controlling the input shaft rotating speed and the output shaft rotating speed of the transfer, and controlling the executing motor in the transfer to run to a preset fourth target position in the position control mode, and acquiring the target NVH measurement data of the transfer in the whole process of maintaining the executing motor at the fourth target position for a preset fourth time length; obtaining the test result of testing the NVH performance of the transfer under the constant speed difference and constant rotating speed transmission torque working condition according to the target NVH measurement data.

7. The method of claim 6, wherein, The testing the NVH performance of the transfer under the constant speed difference and constant rotating speed transmission torque working condition further comprises: acquiring the front transmission torque of the clutch in the transfer; determining whether the position of the executing motor in the transfer reaches the preset fourth target position according to the front transmission torque and a preset second target torque, wherein the second target torque is the torque transmitted by the clutch when the executing motor in the transfer runs to the preset fourth target position.

8. The method of claim 6, wherein, The method further comprises: testing the NVH performance of the transfer under the no speed difference and ascending-descending rotating speed transmission torque working condition by the following steps: controlling the executing motor to run to a preset fifth target position in the position control mode; controlling the rotating speed of the input shaft and the output shaft of the transfer to ascend, and controlling the executing motor to always be at the fifth target position in the position control mode during the ascending process; controlling the rotating speed of the input shaft and the output shaft of the transfer to descend, and controlling the executing motor to always be at the fifth target position in the position control mode during the descending process; acquiring the first NVH measurement data of the transfer during the ascending process, and acquiring the second NVH measurement data of the transfer during the descending process; obtaining the test result of testing the NVH performance of the transfer under the no speed difference and ascending-descending rotating speed transmission torque working condition according to the first NVH measurement data and the second NVH measurement data.

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

10. A transfer output line detection system characterized by, comprises: a transfer; a host computer connected with the transfer, and the host computer is used for: controlling the transfer to perform a first round of static self-learning test, obtaining a first mechanical zero position and a first position of an executing motor in the transfer 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 executing motor when a clutch in the transfer starts to transmit torque; if the first round of static self-learning test result indicates that the test is passed, controlling the transfer to perform a break-in test; after the break-in test, controlling the transfer to perform a second round of static self-learning test, obtaining a second mechanical zero position, a second position and a first value of the executing motor during the second round of static self-learning, wherein the second position is a position of the executing motor when the clutch starts to transmit torque, and the first value is a difference between a maximum value and a minimum value of the position of the executing motor 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.

11. The system of claim 10, wherein, The system further comprises: a drive bench for controlling a rotating speed of an input shaft of the transfer, the drive bench being connected to the upper computer and the transfer respectively; a dynamometer for controlling a rotating speed of an output shaft of the transfer, the dynamometer being connected to the upper computer and the transfer respectively; the upper computer is configured to control the rotating speed of the input shaft of the transfer through the drive bench, control the rotating speed of the output shaft of the transfer through the dynamometer, control the executing motor in the transfer to run to a preset first target position in a position control mode, and control the executing motor in the transfer to maintain at the first target position for a preset first time length.

12. The system of claim 10, wherein, The system further comprises: a drive bench for controlling a rotating speed of an input shaft of the transfer, the drive bench being connected to the upper computer and the transfer respectively; a dynamometer for controlling a rotating speed of an output shaft of the transfer, the dynamometer being connected to the upper computer and the transfer respectively; the upper computer is further configured to, after obtaining the second position of the executing motor during the second round of static self-learning, control the rotating speed of the input shaft of the transfer through the drive bench, control the rotating speed of the output shaft of the transfer through the dynamometer, and control the executing motor in the transfer to start to run from a preset second target position in the position control mode, and obtain a third position of the executing motor when a front torque of the clutch in the transfer meets a test requirement, wherein the test requirement comprises that an absolute value of a difference between the front torque of the clutch in the transfer and a preset first target torque is within a first threshold range; obtain a test result of the clutch in the transfer according to the third position and the second position.

13. The system of claim 10, wherein, The system further comprises: a drive bench for controlling a rotating speed of an input shaft of the transfer, the drive bench being connected to the upper computer and the transfer respectively; a dynamometer for controlling a rotating speed of an output shaft of the transfer, the dynamometer being connected to the upper computer and the transfer respectively; The host computer is further configured to: after the second round of static self-learning test result indicates that the test is passed, control the input shaft speed of the transfer case through the drive bench, control the output shaft speed of the transfer case through the dynamometer, and control the executing motor in the transfer case to run in the position control mode according to a preset position gradient rule from a preset third target position, wherein the preset position gradient rule includes a plurality of positions. Obtain the front transmission torque of the clutch in the transfer case when the executing motor stays at each position for a preset third duration. Obtain the transmission torque characteristic test result of the transfer case according to each position of the executing motor and the front transmission torque.

14. The system of claim 10, wherein, The system further comprises: a drive bench for controlling the input shaft speed of the transfer case, the drive bench being connected with the host computer and the transfer case respectively; a dynamometer for controlling the output shaft speed of the transfer case, the dynamometer being connected with the host computer and the transfer case respectively; The host computer is further configured to: after the second round of static self-learning test result indicates that the test is passed, test the NVH performance of the transfer case in the constant speed difference and constant rotating speed transmission torque working condition by the following steps: control the input shaft speed of the transfer case through the drive bench, control the output shaft speed of the transfer case through the dynamometer, and control the executing motor in the transfer case to run to a preset fourth target position in the position control mode, and obtain the target NVH measurement data of the transfer case in the whole process of maintaining the executing motor at the fourth target position for a preset fourth duration; obtain the test result of testing the NVH performance of the transfer case in the constant speed difference and constant rotating speed transmission torque working condition according to the target NVH measurement data.

15. The system of claim 14, wherein, The host computer is further configured to: obtain the front transmission torque of the clutch in the transfer case; determine whether the position of the executing motor in the transfer case reaches the preset fourth target position according to the front transmission torque and a preset second target torque, wherein the second target torque is the torque transmitted by the clutch when the executing motor in the transfer case runs to the preset fourth target position.

16. The system of claim 14, wherein, The host computer is further configured to: test the NVH performance of the transfer case in the no speed difference and ascending and descending rotating speed transmission torque working condition by the following steps: control the executing motor to run to a preset fifth target position in the position control mode; control the input shaft speed of the transfer case to ascend through the drive bench, control the output shaft speed of the transfer case to ascend through the dynamometer, and control the executing motor to always be located at the fifth target position in the position control mode during the ascending process; control the input shaft speed of the transfer case to descend through the drive bench, control the output shaft speed of the transfer case to descend through the dynamometer, and control the executing motor to always be located at the fifth target position in the position control mode during the descending process; obtain the first NVH measurement data of the transfer case in the ascending process and the second NVH measurement data of the transfer case in the descending process; According to the first NVH measurement data and the second NVH measurement data, a test result of testing the NVH performance of the transfer under the condition of no speed difference and lifting rotating speed is obtained.

17. The system of any of claims 12-16, wherein, The upper computer is also used for: controlling the transfer to perform third wheel static self-learning test, and obtaining a third mechanical zero position and a second value in third wheel static self-learning, wherein the second value is a difference between a maximum value and a minimum value of the motor position when the clutch starts to transmit torque in the third wheel static self-learning process; According to the third mechanical zero position and the second value, a third wheel static self-learning test result of the transfer is obtained.

18. An electronic device, comprising: comprising: a memory and a processor, the memory being connected with the processor; the memory is used for storing programs; the processor is used for calling the programs stored in the memory to execute the method in any one of claims 1-9.

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