Transmission sub-gearbox shifting performance testing device, method and vehicle

Abstract

The application provides a transmission auxiliary gearbox shift performance testing device, method and vehicle, and relates to the field of transmission, and specifically comprises the following steps: running a pre-built performance testing device; based on a shift testing instruction, controlling the performance testing device to switch the auxiliary gearbox gear position; real-time acquisition of pressure parameters of high gear cavities and low gear cavities in a gear switching period, and generation of a pressure change map based on the pressure parameters and time parameters of the high gear cavities and low gear cavities acquired in the gear switching period; based on the pressure change map, when a preset condition is met, acquiring each node corresponding to auxiliary gearbox piston action in the gear switching period; based on each node of the piston action, acquiring the time period of each action of the piston, and comparing the time period of each action with a preset value; based on the comparison result, outputting the performance level of the auxiliary gearbox. The application can quickly complete transmission auxiliary gearbox shift performance testing, and has high efficiency and accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of transmissions, and in particular to a transmission auxiliary box shifting performance testing device, method and vehicle. Background Art

[0002] In the heavy-duty commercial vehicle sector, most domestically produced transmissions are manual mechanical transmissions, and most are equipped with an auxiliary transmission. Testing the auxiliary transmission's shift performance requires testing data during product development, and this is commonly done by measuring the auxiliary transmission's shift displacement. However, manual mechanical transmissions lack internal displacement sensors, requiring additional displacement sensors to be added to the auxiliary transmission's shift fork shaft or piston for testing. This testing method requires modifying the transmission's piston or fork shaft structure, which introduces numerous invariants during vehicle or bench testing. This results in significant test errors, is labor-intensive, and time-consuming, making it impossible to perform without modifying the transmission structure.

[0003] Based on this, there is an urgent need for a transmission auxiliary box shifting performance testing device, method and vehicle, which can accurately measure the transmission auxiliary box shifting performance without changing the mechanical structure of the transmission. Summary of the Invention

[0004] The purpose of this application is to provide a transmission auxiliary box shifting performance test device, method and vehicle, which can quickly complete the transmission auxiliary box shifting performance test without modifying the transmission structure. The specific scheme is as follows:

[0005] A method for testing the shifting performance of a transmission auxiliary box comprises the following steps:

[0006] Step 1: Run the pre-built performance test device;

[0007] Step 2: Based on the gear shift test instruction, control the performance test device to switch the auxiliary gear position;

[0008] Step 3: collecting pressure parameters of the auxiliary box high gear chamber and the auxiliary box low gear chamber in real time during the gear switching cycle, and generating a pressure change map based on the pressure parameters of the high gear chamber and the low gear chamber collected during the gear switching cycle and the time parameters;

[0009] Step 4: Based on the pressure change map, when the preset conditions are met, each node corresponding to the auxiliary box piston action in the gear shift cycle is obtained;

[0010] Step 5: Based on each node of the piston movement, collect the time period of each piston movement, and compare the time period of each movement with the preset value;

[0011] Step 6: Based on the comparison results, output the performance level of the auxiliary box.

[0012] Optionally, the various nodes include: a shift command starting point, a shift action starting point, a synchronization process starting point, a shift gear entry starting point, and a shift end point.

[0013] Optionally, the precondition includes:

[0014] When the air pressure in the auxiliary tank begins to change and the slope of the curve is greater than a first preset value, the starting point of the air pressure change is used as the starting point of the shift command;

[0015] When the curves corresponding to the high gear cavity and the low gear cavity in the auxiliary box intersect, the intersection of the curves is used as the starting point of the gear shift action;

[0016] When the air pressure in the auxiliary box changes from irregular changes to stable changes, and the slope of the curve of the stable change of the air pressure is greater than the second preset value, the starting point of the stable change of the air pressure is used as the starting point of the synchronization process, and the ending point of the stable change of the air pressure is used as the starting point of the gear shifting process, wherein the slope of the curve of the ending point of the stable change of the air pressure is less than the third preset value;

[0017] When the air pressure in the auxiliary box changes from irregular to stable change until the air pressure is constant, the starting point of the stable change of the air pressure is used as the end point of the gear shift, wherein the slope of the curve of the gear shift end point is greater than a fourth preset value.

[0018] Optionally, collecting the time period of each piston action at each node based on the piston action specifically includes:

[0019] Based on the pressure change map, the time coordinate value of each node is collected;

[0020] Based on the time coordinate value of each node, the time period corresponding to each piston action is obtained; the time period of each action includes: total shift time, shift response time, shift synchronization time, shift gear entry time;

[0021] Among them, the total shift time is the time interval between the end point of the shift and the start point of the shift command; the shift response time is the time interval between the start point of the shift action and the start point of the shift command; the shift synchronization time is the time interval between the start point of the shift tooth advance and the start point of the synchronization process; the shift tooth advance time is the time interval between the end point of the shift and the start point of the shift tooth advance.

[0022] Based on the comparison results, the performance level of the auxiliary box is output.

[0023] Optionally,

[0024] Based on the comparison results, the performance level of the output auxiliary box specifically includes:

[0025] When the auxiliary tank performance level is poor, the intake pressure of the auxiliary tank is added in units of a preset pressure value, and steps 1-5 are repeated until the auxiliary tank performance level is higher than the poor level;

[0026] When the sub-tank performance level is higher than the poor level, a first intake pressure is acquired.

[0027] A transmission auxiliary box shifting performance test device is applied to the transmission auxiliary box shifting performance test method; the device comprises: an electronically controlled pressure regulating valve and a reversing valve connected by a pipeline;

[0028] The reversing valve is connected to the transmission auxiliary box through a pipeline, and is used to switch the gear position of the transmission auxiliary box; wherein the reversing valve is a two-position four-way valve;

[0029] The reversing valve is connected to the high-speed gear chamber and the low-speed gear chamber of the transmission auxiliary box through a first pipe and a second pipe respectively;

[0030] The first pipeline is provided with a first pressure sensor for measuring the high-speed chamber pressure; the second pipeline is provided with a second pressure sensor for measuring the low-speed chamber pressure; and it also includes an air source switch for controlling the reversing of the reversing valve; wherein, the air source switch is connected to the electronically controlled pressure regulating valve through the third pipeline and is connected to the reversing valve through the fourth pipeline.

[0031] A transmission auxiliary box shifting performance test system, comprising:

[0032] A run module configured to run a pre-built performance test device;

[0033] A gear shift module configured to control the performance test device to switch the auxiliary gear based on the gear shift test instruction;

[0034] a map generation module configured to collect pressure parameters of the auxiliary box high gear cavity and the auxiliary box low gear cavity in real time during a gear switching cycle, and generate a pressure change map based on the pressure parameters of the high gear cavity and the low gear cavity collected during the gear switching cycle and a time parameter;

[0035] an acquisition module configured to acquire, based on the pressure change map, each node corresponding to the action of the auxiliary box piston within the gear shift cycle when a preset condition is met;

[0036] a comparison module configured to obtain a time period of each piston action based on each node of the piston action, and compare the time period of each action with a preset value;

[0037] The grade output module is configured to output a performance grade of the auxiliary box based on the comparison result.

[0038] An electronic device comprises: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method.

[0039] A computer-readable storage medium stores a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of the method.

[0040] A vehicle is provided with the transmission auxiliary box shifting performance testing system.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention provides a transmission auxiliary box shifting performance test device, method and vehicle; the auxiliary box gear switching is controlled by running a pre-built performance test device; the pressure parameters of the auxiliary box high gear chamber and the auxiliary box low gear chamber during the gear switching cycle are collected in real time, and a pressure change map is generated based on the pressure parameters and time parameters of the high gear chamber and the low gear chamber collected during the gear switching cycle; based on the pressure change map, when the preset conditions are met, each node corresponding to the auxiliary box piston action during the gear switching cycle is obtained, and then the time period of each piston action is obtained, and the performance level of the auxiliary box is obtained by comparing the time period of each action with the preset value; it can be understood that the present application does not require changing the transmission piston or fork shaft structure, replaces manual operation, can quickly and accurately measure the shifting performance of the transmission auxiliary box, saves time and effort, and improves the overall testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a flow chart of the transmission auxiliary box shifting performance test method;

[0044] Figure 2 This is a structural diagram of the transmission auxiliary box shifting performance test device;

[0045] Figure 3 It is a curve diagram of the pressure change in the high gear cavity and the low gear cavity during the process of switching from low gear to high gear in the auxiliary box of the variable speed drive;

[0046] Figure 4 This is a curve diagram of the pressure changes in the high-gear cavity and the low-gear cavity during the process of switching the variable auxiliary box from high gear to low gear. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application clearer, the following Figure 1-4This application is further described in detail. Obviously, the embodiments described are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0049] The present application provides a method for testing the shifting performance of a transmission auxiliary box, comprising the following steps:

[0050] Step 1: Run the pre-built performance test device;

[0051] Step 2: Based on the gear shift test instruction, control the performance test device to switch the auxiliary gear position;

[0052] Step 3: Real-time collection of pressure parameters of the high-gear cavity and the low-gear cavity during the gear switching cycle, and generation of a pressure change map based on the pressure parameters and time parameters of the high-gear cavity and the low-gear cavity collected during the gear switching cycle;

[0053] Step 4: Based on the pressure change map, when the preset conditions are met, each node corresponding to the auxiliary box piston action in the gear shift cycle is obtained;

[0054] Step 5: Based on each node of the piston action, obtain the time period of each piston action, and compare the time period of each action with the preset value;

[0055] Step 6: Based on the comparison results, output the performance level of the auxiliary box.

[0056] It can be understood that in this application, the pressure parameters of the high-gear chamber and the low-gear chamber during the gear switching cycle are collected in real time, and a pressure change map is produced based on the pressure parameters and time parameters; based on the pressure change map, when the preset conditions are met, the various nodes of the auxiliary box piston action during the gear switching cycle are obtained, and the performance level of the auxiliary box is evaluated based on the time interval of each node.

[0057] It can be understood that during the gear shifting process, the piston in the auxiliary box moves under the action of high-pressure gas, thereby increasing the number of gears of the transmission and expanding the transmission ratio range to adapt to different driving conditions and engine operating conditions; in this application, the overall performance of the auxiliary box is evaluated by measuring the corresponding action cycle time during the piston movement stroke during the gear shifting process, which is efficient and accurate.

[0058] Optionally, the nodes include: a shift command start point, a shift action start point, a synchronization process start point, a shift gear start point, and a shift end point; and the preconditions include:

[0059] When the air pressure in the auxiliary tank begins to change and the slope of the curve is greater than a first preset value, the starting point of the air pressure change is used as the starting point of the shift command;

[0060] When the curves corresponding to the high gear cavity and the low gear cavity in the auxiliary box intersect, the intersection of the curves is used as the starting point of the gear shift action;

[0061] When the air pressure in the auxiliary box changes from irregular changes to stable changes, and the slope of the curve of the stable change of the air pressure is greater than the second preset value, the starting point of the stable change of the air pressure is used as the starting point of the synchronization process, and the ending point of the stable change of the air pressure is used as the starting point of the gear shifting process, wherein the slope of the curve of the ending point of the stable change of the air pressure is less than the third preset value;

[0062] When the air pressure in the auxiliary box changes from irregular to stable change until the air pressure is constant, the starting point of the stable change of the air pressure is used as the end point of the gear shift, wherein the slope of the curve of the gear shift end point is greater than a fourth preset value.

[0063] For example, Figure 3 The low gear shown is switched to a high gear as an example.

[0064] In the figure: the starting point of the shift command is a, the starting point of the shift action is b, the starting point of the synchronization process is c, the starting point of the shift gear is d, and the end point of the shift is e; 100, the high-speed cavity pressure change curve; 200, the low-speed cavity pressure change curve; Among them, Figure 3 The horizontal axis represents time, and the vertical axis represents pressure value.

[0065] When the air pressure in the auxiliary box starts to change for the first time, the starting point of the air pressure change is taken as the shift command starting point a. At this time, the slope of the air pressure change curve at point a is k. a Greater than tan60°;

[0066] As the pressure in the high-gear chamber continues to rise, when the pressures in the high-gear chamber and the low-gear chamber in the auxiliary box are the same, that is, the corresponding curves of the two intersect, the intersection point of the curves is used as the starting point b of the shifting action. It can be understood that after the intersection point of the curves, the thrust of the compressed air on the cylinder piston is greater than the resistance, and the piston begins to move at this time; at this time, it needs to satisfy: P high * S high > P low * S low + F resistance, among which P high is the pressure in the high-gear chamber, S high: the effective area of ​​compressed air in the high-gear chamber, P low: the pressure in the low-gear chamber, S low: the effective area of ​​compressed air in the low-gear chamber, and F resistance is the friction resistance during the movement of the piston.

[0067] As the piston moves, the air pressure in the high-speed and low-speed chambers begins to change unstably until the air pressure in the high-speed chamber rises steadily. This indicates that the piston stops moving and reaches the starting point c of the synchronization process. The shift synchronization process begins and the synchronizer starts working. Point c is the synchronization starting point. At this time, the pressure change slope k at point c is c >tan45°.

[0068] It can be understood that after the synchronization is completed, the cylinder piston continues to move and starts the gear shifting action. During the synchronization process, the air pressure in the high gear chamber begins to drop. When it reaches the end point of the synchronization process or the starting point d of the gear shifting and gear shifting, the synchronization process ends. At this time, the air pressure change slope at the starting point d of the gear shifting and gear shifting is less than k d <-tan45°.

[0069] It can be understood that the process from the beginning to the end of the synchronization process is the speed matching process before the piston enters the teeth; among them, the longer the synchronization time, the worse the synchronizer performance of the transmission, that is, the worse the friction performance, and the worse the overall performance of the auxiliary box; the shorter the synchronization time, the better the synchronizer performance, that is, the better the friction performance of the synchronizer.

[0070] Specifically, after the gear shift begins, the pressure in the high gear chamber begins to drop and show unstable changes. When the gear shift is completed, it reaches the gear shift end point or the gear shift end point e, that is, the unstable change state ends, indicating that the gear shift is completed. At this time, the pressure in the high gear chamber gradually rises until the air pressure is constant, indicating that the piston displacement no longer changes after reaching the gear shift end point e, and the gear shift stroke is completed; wherein, the air pressure change slope at the gear shift end point e satisfies k e >tan35°.

[0071] It can be understood that the shorter the time interval between the end point of the gear shift and the start point of the gear shift, the faster the gear shift action is, which indicates that the performance of the auxiliary box is better.

[0072] In this embodiment, the pressure change curve is used to correspond to the action change points of the piston during the gear shifting process, and the speed of the action during the gear shifting process can be directly obtained through a graph, thereby obtaining the performance of the auxiliary box. This method replaces the existing technology of changing the structure of the auxiliary box shift fork shaft or adding a displacement sensor, and the efficiency is significantly improved. It can be applied to all performance test operations of the auxiliary box.

[0073] Specifically, in actual measurements, this application collects pressure parameters and displacement parameters of the high-gear cavity and the low-gear cavity in several groups of shift cycles. Based on the mapping relationship between the two and combined with preset conditions, each node of the piston action can be accurately obtained.

[0074] Optionally, collecting the time period of each piston action at each node based on the piston action specifically includes:

[0075] Based on the pressure change map, the time coordinate value of each node is established;

[0076] Based on the time coordinate value of each node, the time period corresponding to each piston action is obtained; the time period of each action includes: total shift time, shift response time, shift synchronization time, shift gear entry time;

[0077] Among them, the total shift time is the time interval between the end point of the shift and the start point of the shift command; the shift response time is the time interval between the start point of the shift action and the start point of the shift command; the shift synchronization time is the time interval between the start point of the shift tooth advance and the start point of the synchronization process; the shift tooth advance time is the time interval between the end point of the shift and the start point of the shift tooth advance.

[0078] It can be understood that in this embodiment, the performance level of the auxiliary box is determined by comparing the time period of each action of the piston in the shift cycle with the corresponding preset value.

[0079] Specifically, if the total shifting time is greater than or equal to the first design value, such as 1 second, it indicates that the shifting time is too long, the performance level of the auxiliary box is poor, and the product is unqualified; conversely, if the total shifting time is less than the first design value, it indicates that the product is qualified.

[0080] If the total shifting time is less than the first design value, and the shifting response time is less than the second design value (eg, 0.1 seconds), it indicates that the performance level of the auxiliary transmission is medium.

[0081] If the total shift time is less than the first design value, the shift response time is less than the second design value, and the gear shift time is less than the third design value (eg, 0.2 seconds), it indicates that the performance level of the auxiliary box is good.

[0082] If the total shifting time is less than the first design value, the shifting response time is less than the second design value, the shifting gear time is less than the third design value, and the shifting synchronization time is less than the fourth preset value (e.g., 0.6 seconds), it indicates that the performance level of the auxiliary box is excellent.

[0083] It can be understood that the present application obtains the performance level of the auxiliary box by comparing the time period of each action with the preset value.

[0084] The advantage of adopting this method is that the performance level of the auxiliary box can be measured quickly and accurately without changing the variable structure. Compared with the existing technology, it saves time and labor and is highly efficient.

[0085] Optionally, before obtaining the time period of each piston action based on each node of the piston action and comparing the time period of each action with a preset value, the following steps are further included:

[0086] Repeat steps 1-4 a preset number of times (e.g., 5 times), calculate the average value of each piston action time period within the preset number of times; compare the average value of each action time period with the preset value; and output the performance level of the auxiliary box based on the comparison results.

[0087] It can be understood that in this step, by collecting the time period of each action in the shift cycle multiple times and comparing the average value of each action time period with the preset value, the accuracy of the auxiliary box performance output is further increased.

[0088] Optionally, the outputting of the performance level of the auxiliary box based on the comparison result specifically includes:

[0089] When the auxiliary tank performance level is poor, the intake pressure of the auxiliary tank is added in units of a preset pressure value, and steps 1-5 are repeated until the auxiliary tank performance level is higher than the poor level;

[0090] When the sub-tank performance level is higher than the poor level, a first intake pressure is acquired.

[0091] Specifically, when the level of the auxiliary tank is poor, the pressure is increased by 0.01 MPa each time until the total shift time is less than a first design value, and then the current intake pressure data is acquired.

[0092] It can be understood that in this embodiment, when the auxiliary box grade is poor, that is, the total shift time is greater than or equal to 1 second, the shift force is increased by increasing the intake pressure, thereby shortening the total shift time and ensuring that the product meets the qualified standard. At the same time, the adjusted intake pressure value is used as the intake pressure design value for subsequent products.

[0093] In the figure: 1. Electronically controlled pressure regulating valve; 2. Reversing valve; 3. Transmission auxiliary box; 4. High-speed gear chamber; 5. First pipeline; 6. First pressure sensor; 7. Low-speed gear chamber; 8. Second pipeline; 9. Second pressure sensor; 10. Air source switch; 11. Third pipeline; 12. Fourth pipeline; 13. Fifth pipeline.

[0094] On the other hand, the present application provides a transmission auxiliary case shifting performance test device, which is applied to the transmission auxiliary case shifting performance test method described above; the device includes: an electronically controlled pressure regulating valve and a reversing valve connected by pipelines; the reversing valve is connected to the transmission auxiliary case via a pipeline and is used to switch the gear of the transmission auxiliary case; wherein the reversing valve is a two-position four-way valve; the reversing valve is connected to the high-speed chamber and the low-speed chamber of the transmission auxiliary case via a first pipeline and a second pipeline respectively; the first pipeline is provided with a first pressure sensor for measuring the pressure of the high-speed chamber; and the second pipeline is provided with a second pressure sensor for measuring the pressure of the low-speed chamber; and further includes an air source switch for controlling the reversing of the reversing valve; wherein the air source switch is connected to the electronically controlled pressure regulating valve via a third pipeline and to the reversing valve via a fourth pipeline. The air source switch is used to drive the reversing valve to shift through the fourth pipeline, thereby realizing the gear switching of the transmission auxiliary case.

[0095] On the other hand, the present application provides a transmission auxiliary box shifting performance testing system, comprising:

[0096] A run module configured to run a pre-built performance test device;

[0097] A gear shift module configured to control the performance test device to switch the auxiliary gear based on the gear shift test instruction;

[0098] a map generation module configured to collect pressure parameters of the auxiliary box high gear cavity and the auxiliary box low gear cavity in real time during a gear switching cycle, and generate a pressure change map based on the pressure parameters of the high gear cavity and the low gear cavity collected during the gear switching cycle and a time parameter;

[0099] an acquisition module configured to acquire, based on the pressure change map, each node corresponding to the action of the auxiliary box piston within the gear shift cycle when a preset condition is met;

[0100] a comparison module configured to obtain a time period of each piston action based on each node of the piston action, and compare the time period of each action with a preset value;

[0101] The grade output module is configured to output a performance grade of the auxiliary box based on the comparison result.

[0102] It is worth noting that although only some basic functional modules are disclosed in the embodiment of the present invention, it does not mean that the composition of the present system is limited to the above basic functional modules. On the contrary, what this embodiment wants to express is that on the basis of the above basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the existing technology to form an infinite number of embodiments or technical solutions. In other words, this system is open rather than closed. Just because this embodiment only discloses individual basic functional modules, it cannot be considered that the scope of protection of the claims of the present invention is limited to the disclosed basic functional modules. At the same time, for the convenience of description, the above devices are described in terms of functions, which are divided into various units and modules. Of course, when implementing the present invention, the functions of each unit and module can be implemented in the same or one or more software and / or hardware.

[0103] The present invention also provides an electronic device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the transmission auxiliary box shifting performance test method.

[0104] The present invention also provides a computer-readable storage medium storing a computer program executable by an electronic device, wherein when the computer program runs on the electronic device, the electronic device executes the steps of the method.

[0105] The present invention also provides a vehicle, which is provided with the transmission auxiliary box shifting performance testing system.

[0106] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

Claims

1. A transmission auxiliary box shifting performance testing method, characterized in that: The following steps are involved: Step 1: Run the pre-built performance test device; Step 2: Based on the gear shift test instruction, control the performance test device to switch the auxiliary gear position; Step 3: Real-time collection of pressure parameters of the high-gear cavity and the low-gear cavity during the gear switching cycle, and generation of a pressure change map based on the pressure parameters and time parameters of the high-gear cavity and the low-gear cavity collected during the gear switching cycle; Step 4: Based on the pressure change map, when the preset conditions are met, each node corresponding to the auxiliary box piston action in the gear shift cycle is obtained; Step 5: Based on each node of the piston movement, collect the time period of each piston movement, and compare the time period of each movement with the preset value; Step 6: Based on the comparison results, output the performance level of the auxiliary box.

2. The transmission auxiliary box shifting performance testing method according to claim 1, characterized in that: The various nodes include: a shift command starting point, a shift action starting point, a synchronization process starting point, a shift gear start point, and a shift end point.

3. The transmission auxiliary box shifting performance testing method according to claim 2, characterized in that: The preset conditions include: When the air pressure in the auxiliary tank begins to change and the slope of the curve is greater than a first preset value, the starting point of the air pressure change is used as the starting point of the shift command; When the curves corresponding to the high gear cavity and the low gear cavity in the auxiliary box intersect, the intersection of the curves is used as the starting point of the gear shift action; When the air pressure in the auxiliary box changes from irregular changes to stable changes, and the slope of the curve of the stable change of the air pressure is greater than the second preset value, the starting point of the stable change of the air pressure is used as the starting point of the synchronization process, and the ending point of the stable change of the air pressure is used as the starting point of the gear shifting process, wherein the slope of the curve of the ending point of the stable change of the air pressure is less than the third preset value; When the air pressure in the auxiliary box changes from irregular to stable change until the air pressure is constant, the starting point of the stable change of the air pressure is used as the end point of the gear shift, wherein the slope of the curve of the gear shift end point is greater than a fourth preset value.

4. The transmission auxiliary box shifting performance testing method according to claim 3, characterized in that: The time period of each piston action is collected at each node based on the piston action, specifically including: Based on the pressure change map, the time coordinate value of each node is collected; Based on the time coordinate value of each node, the time period corresponding to each piston action is obtained; the time period of each action includes: total shift time, shift response time, shift synchronization time, shift gear entry time; The total shift time is the time interval between the end point of the shift and the start point of the shift command; the shift response time is the time interval between the start point of the shift action and the start point of the shift command; the shift synchronization time is the time interval between the start point of the shift gear advance and the start point of the synchronization process; the shift gear advance time is the time interval between the end point of the shift and the start point of the shift gear advance; Based on the comparison results, the performance level of the auxiliary box is output.

5. The transmission auxiliary box shifting performance testing method according to claim 4, characterized in that: Based on the comparison results, the performance level of the output auxiliary box specifically includes: When the auxiliary tank performance level is poor, the intake pressure of the auxiliary tank is added in units of a preset pressure value, and steps 1-5 are repeated until the auxiliary tank performance level is higher than the poor level; When the sub-tank performance level is higher than the poor level, a first intake pressure is acquired.

6. A gear shifting performance testing device for a transmission auxiliary box, characterized in that: The transmission auxiliary box shifting performance testing method according to any one of claims 1 to 5 is applied; the device comprises: an electronically controlled pressure regulating valve and a reversing valve connected by a pipeline; The reversing valve is connected to the transmission auxiliary box through a pipeline, and is used to switch the gear position of the transmission auxiliary box; wherein the reversing valve is a two-position four-way valve; The reversing valve is connected to the high-speed gear chamber and the low-speed gear chamber of the transmission auxiliary box through a first pipe and a second pipe respectively; The first pipeline is provided with a first pressure sensor for measuring the high-speed chamber pressure; the second pipeline is provided with a second pressure sensor for measuring the low-speed chamber pressure; and it also includes an air source switch for controlling the reversing of the reversing valve; wherein, the air source switch is connected to the electronically controlled pressure regulating valve through the third pipeline and is connected to the reversing valve through the fourth pipeline.

7. A transmission auxiliary box shifting performance test system, characterized in that: include: A run module configured to run a pre-built performance test device; A gear shift module configured to control the performance test device to switch the auxiliary gear based on the gear shift test instruction; a map generation module configured to collect pressure parameters of the auxiliary box high gear cavity and the auxiliary box low gear cavity in real time during a gear switching cycle, and generate a pressure change map based on the pressure parameters of the high gear cavity and the low gear cavity collected during the gear switching cycle and a time parameter; an acquisition module configured to acquire, based on the pressure change map, each node corresponding to the action of the auxiliary box piston within the gear shift cycle when a preset condition is met; a comparison module configured to obtain a time period of each piston action based on each node of the piston action, and compare the time period of each action with a preset value; The grade output module is configured to output a performance grade of the auxiliary box based on the comparison result.

8. An electronic device, characterized in that: include: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that It stores a computer program that can be executed by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of the method according to any one of claims 1 to 5.

10. A vehicle, characterized in that: The vehicle is provided with the transmission auxiliary box shifting performance testing system as claimed in claim 7.

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