High and low temperature sealing test method and system for automatic transmission

Abstract

The present invention discloses a high and low temperature sealing test method and system for an automatic transmission, the method comprising: when the temperature of the automatic transmission is stable within a first preset temperature range, within a first preset time, the operating state of the clutch, the input shaft speed and the output shaft speed of the automatic transmission are respectively controlled according to the operating parameter, the first rotation parameter and the first simulation parameter; the temperature regulating device is turned off, and within a second preset time, the operating state of the clutch and the main oil circuit in the automatic transmission is controlled according to the control parameter, so that the transmission is heated to a second preset temperature range, and the input shaft speed and the output shaft speed of the automatic transmission are respectively controlled according to the second rotation parameter and the second simulation parameter; finally, the automatic transmission is controlled to stop rotating, and whether there is oil leakage in each sealing part. The technical solution of the present invention can improve the test accuracy of the high and low temperature sealing of the automatic transmission, and realize the automated test of the high and low temperature sealing of the automatic transmission.

Description

Technical Field

[0001] The invention relates to the field of transmission sealing test, and in particular to a high and low temperature sealing test method and system for an automatic transmission. Background Art

[0002] During the development of automatic transmission products, automatic transmission assembly seals (clutch cover assembly oil seal, output shaft seal ring, etc.) face failure problems under high and low temperature conditions. Existing technical means mostly use high and low temperature sealing verification at the component level. This verification method cannot accurately simulate the actual working conditions of the transmission assembly seals. Summary of the invention

[0003] The present invention provides a high and low temperature sealing test method and system for an automatic transmission, so as to solve the problem that the high and low temperature sealing verification at the component level in the prior art cannot accurately simulate the actual working conditions of the transmission assembly seal.

[0004] According to one aspect of the present invention, a high and low temperature sealing test method for an automatic transmission is provided, comprising:

[0005] S10, after the automatic transmission is assembled, starting a temperature regulating device to control the automatic transmission to cool down;

[0006] S20, when the temperature of the automatic transmission is stable within a first preset temperature range, acquiring an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter;

[0007] S30, within a first preset time, controlling the operating state of the clutch according to the operating parameter, controlling the input shaft speed of the automatic transmission according to the first rotation parameter, and controlling the output shaft speed of the automatic transmission according to the first simulation parameter;

[0008] S40, turning off the temperature adjustment device, and acquiring a control parameter of the automatic transmission, a second rotation parameter of the automatic transmission, and a second simulation parameter;

[0009] S50, within a second preset time, controlling the operating states of the clutch and the main oil circuit in the automatic transmission according to the control parameter to heat the transmission to a second preset temperature range, and controlling the input shaft speed of the automatic transmission according to the second rotation parameter, and controlling the output shaft speed of the automatic transmission according to the second simulation parameter;

[0010] S60, controlling the automatic transmission to stop rotating, and determining whether there is oil leakage at each sealing part of the automatic transmission;

[0011] S70. When it is determined that there is no oil leakage at each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

[0012] Optionally, the operating parameters include the lubrication flow, lubrication cycle and preset sliding friction pressure of the clutch; the first rotation parameter includes a first rotation speed and a second rotation speed; the second rotation speed is greater than the first rotation speed; the first simulation parameter includes a first simulated vehicle speed and a second simulated vehicle speed; the second simulated vehicle speed is greater than the first simulated vehicle speed; the first preset time includes a first rotation time and a second rotation time; the second rotation time is located after the first rotation time;

[0013] Optionally, S30 specifically includes:

[0014] During the first preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow according to the lubrication cycle, and the slip pressure of the clutch is controlled to be the preset slip pressure; the preset slip pressure is 0 MPa;

[0015] During the first rotation time, controlling the input shaft of the automatic transmission to rotate at the first rotation speed, and controlling the output shaft of the automatic transmission to rotate at a rotation speed corresponding to the first simulated vehicle speed;

[0016] During the second rotation time, the input shaft of the automatic transmission is controlled to rotate at the second rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the second simulated vehicle speed.

[0017] Optionally, the second rotation parameter includes a third rotation speed and a fourth rotation speed; the fourth rotation speed is greater than the third rotation speed; the second simulation parameter includes a third simulation speed and a fourth simulation speed; the fourth simulation speed is greater than the third simulation speed; the control parameter includes a first slip cycle, a first slip pressure, a second slip cycle, a second slip pressure, a lubrication cycle and a lubrication flow rate of the clutch, and a set pressure of the main oil circuit; the second preset time includes a third rotation time and a fourth rotation time; the fourth rotation time is located after the third rotation time;

[0018] Optionally, S50 specifically includes:

[0019] During the second preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow according to the lubrication cycle;

[0020] During the third rotation time, the input shaft of the transmission is controlled to rotate at the third rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the third simulated vehicle speed, and the clutch is controlled to slip with the first slip cycle and the first slip pressure, so that the automatic transmission is heated up to within the second preset temperature range at a fixed slope;

[0021] During the fourth rotation time, the input shaft of the transmission is controlled to rotate at the fourth rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the fourth simulated vehicle speed, and the clutch is controlled to slip with the second slip cycle and the second slip pressure, and the pressure of the main oil circuit is controlled to be the set pressure, so that the temperature of the automatic transmission is stabilized within the second preset temperature range.

[0022] Optionally, both the first sliding cycle and the second sliding cycle include sliding time and non-slip time; the sliding time is within the time when the lubrication flow of the clutch in each lubrication cycle is the maximum lubrication flow.

[0023] Optional, before S10, also includes:

[0024] Performing integrity inspection on each seal of the automatic transmission;

[0025] After confirming that the seal is intact, refitting the automatic transmission according to the design requirements of the automatic transmission;

[0026] After the assembly is completed, the automatic transmission is subjected to surface treatment.

[0027] Optionally, after assembly, the automatic transmission is subjected to surface treatment, including:

[0028] After the assembly is completed, removing the surface attachments of the automatic transmission;

[0029] A developer is sprayed on the joint surfaces of each seal of the automatic transmission and the housing of the automatic transmission, and the developer is air-dried.

[0030] Optional, before S10, also includes:

[0031] Adjusting the temperature of the automatic transmission to a third preset temperature range, and acquiring the running-in speed and running-in vehicle speed of the clutch; wherein the temperature within the third preset temperature range is greater than the temperature within the first preset temperature range and less than the temperature within the second preset temperature range;

[0032] During the running-in time, the input shaft of the automatic transmission is controlled to rotate at the running-in speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the running-in vehicle speed.

[0033] Optionally, also include:

[0034] During the running-in time, the lubrication flow rate of the clutch is controlled to be 0 L / min, and the slip pressure of the clutch is controlled to be 0 MPa.

[0035] Another aspect of the present invention provides a high and low temperature sealing test system for an automatic transmission, which is used to perform the high and low temperature sealing test method for the automatic transmission, and comprises: a temperature control box, a drive dynamometer, a first drive shaft, at least one load dynamometer, at least one second drive shaft and a test bench controller;

[0036] The temperature control box is provided with a temperature regulating device; the temperature control box is used to place the automatic transmission to be tested;

[0037] The driving dynamometer is connected to the input shaft of the automatic transmission via the first driving shaft;

[0038] Each of the load dynamometers is connected to each output shaft of the automatic transmission via each of the second drive shafts;

[0039] The test bench controller is electrically connected to the temperature regulating device, the drive dynamometer, and each of the load dynamometers respectively; the test bench controller is used to control the operating status of the temperature regulating device, the drive dynamometer, and each of the load dynamometers.

[0040] Optionally, the high and low temperature sealing test system of the automatic transmission further includes: an industrial computer;

[0041] The test bench controller is communicatively connected with the industrial computer.

[0042] The technical solution of the embodiment of the present invention controls the input shaft and the output shaft of the automatic transmission to run at different speeds when the automatic transmission is in different temperature ranges to simulate the actual vehicle operating conditions, so that the high and low temperature sealing test of the automatic transmission is closer to the state of the actual vehicle during operation, thereby making the experimental results more accurate and improving the test accuracy of the automatic transmission.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 This is a flow chart of a high and low temperature sealing test method for an automatic transmission provided according to the first embodiment of the present invention;

[0046] Figure 2 This is a flow chart of a high and low temperature sealing test method for an automatic transmission provided according to a second embodiment of the present invention;

[0047] Figure 3 is a schematic diagram of a clutch lubrication flow pulse waveform provided according to the second embodiment of the present invention;

[0048] Figure 4 is a flow chart of a high and low temperature sealing test method for an automatic transmission provided according to a third embodiment of the present invention;

[0049] Figure 5 is a flow chart of a high and low temperature sealing test method for an automatic transmission provided according to a fourth embodiment of the present invention;

[0050] Figure 6 It is a structural schematic diagram of a high and low temperature sealing test system for an automatic transmission provided according to Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] An embodiment of the present invention provides a high and low temperature sealing test method for an automatic transmission, which can test the sealing of an automatic transmission after running in high and low temperature states. The high and low temperature sealing test method for an automatic transmission can be performed using a high and low temperature sealing test system for an automatic transmission provided by an embodiment of the present invention, and the high and low temperature sealing test system for an automatic transmission can be implemented in the form of hardware and / or software.

[0054] Embodiment 1

[0055] Figure 1 This is a flow chart of a high and low temperature sealing test method for an automatic transmission provided in the first embodiment of the present invention. Figure 1 As shown, the method includes:

[0056] S10: After the automatic transmission is assembled, start the temperature regulating device to control the automatic transmission to cool down.

[0057] Among them, the sealing of the automatic transmission is one of the factors that affect its working state. In the actual operation of the automatic transmission, oil leakage may occur, which will in turn affect the operation of the entire vehicle. The reasons for oil leakage may be improper assembly or shedding of parts, mismatched parts, excessive operating temperature causing excessive pressure in the transmission, etc., which are not limited here.

[0058] Specifically, the temperature regulating device can regulate the temperature of the environment in which the automatic transmission is located, simulate the actual vehicle conditions at different temperatures, and then conduct high and low temperature sealing tests of the automatic transmission. Accordingly, after the automatic transmission is assembled, the temperature regulating device is started to control the automatic transmission to cool down, so that the automatic transmission is in a lower temperature environment. The temperature value can be set according to actual needs and is not limited here.

[0059] S20. When the temperature of the automatic transmission is stabilized within a first preset temperature range, an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter are obtained.

[0060] The first preset temperature value can be set according to actual needs. For example, the first preset temperature range is (-40±3)℃, which simulates the operation of the automatic transmission at low temperatures, such as driving conditions in the early morning of winter. The operation parameters of the clutch of the automatic transmission are related parameters that represent the lubricating oil matching and clutch state during the operation of the clutch. Therefore, obtaining the operation parameters of the clutch can control the overall operation of the automatic transmission; the first rotation parameter and the first simulation parameter of the automatic transmission can represent the speed of the input shaft and the vehicle speed corresponding to the output shaft in the actual working condition of the automatic transmission.

[0061] Specifically, when the temperature of the automatic transmission is stable within the first preset temperature range, the automatic transmission is in a set low temperature environment. By obtaining the operating parameters of the clutch of the automatic transmission, the first rotation parameter of the automatic transmission and the first simulation parameter, the actual vehicle condition of the automatic transmission is simulated.

[0062] S30. Within a first preset time, control the operating state of the clutch according to the operating parameter, control the input shaft speed of the automatic transmission according to the first rotation parameter, and control the output shaft speed of the automatic transmission according to the first simulation parameter.

[0063] Among them, the first preset time is the low-temperature sealing test time of the automatic transmission assembly, which can be set according to actual needs and is not limited here, such as 1h, 2h, 3h. The first rotation parameter includes but is not limited to the rotation speed of the automatic transmission input shaft, and the first simulation parameter includes but is not limited to the simulated vehicle speed during the simulated vehicle driving process; the input shaft of the automatic transmission can match the power output of the engine, and the automatic transmission converts the power output of the engine in a certain proportion and provides it to the driving mechanism of the vehicle to make the vehicle travel at a certain speed. In this way, the power output of the engine can be simulated by controlling the rotation speed of the automatic transmission input shaft, and the required rotation speed of the automatic transmission output shaft can be determined by simulating the vehicle speed during the vehicle driving process, so as to simulate the working state of the automatic transmission during the vehicle operation.

[0064] In addition, the operating parameters include but are not limited to the slip pressure and slip pressure of the clutch in the automatic transmission, based on which the operating state of the clutch can be controlled to match the current operating state of the automatic transmission, and the operating state of the automatic transmission when the vehicle is driving in a low-temperature environment can be simulated, so that the operating state of the automatic transmission under the test conditions is closer to the operating state when it is installed on the vehicle, thereby realizing the testing of the sealing of the automatic transmission when it is running in a low-temperature environment.

[0065] S40, turning off the temperature adjustment device, acquiring a control parameter of the automatic transmission, a second rotation parameter of the automatic transmission, and a second simulation parameter.

[0066] Among them, after the temperature adjustment device is turned off, the temperature of the automatic transmission and its environment will increase, which is consistent with the situation that the temperature of the automatic transmission will slowly increase with the driving time during the actual operation of the vehicle. Under this condition, the control parameters of the automatic transmission, the second rotation parameters of the automatic transmission and the second simulation parameters can be obtained, so as to control the operating state of the automatic transmission based on these parameters.

[0067] S50. Within a second preset time, the operating states of the clutch and the main oil circuit in the automatic transmission are controlled according to the control parameters to heat the transmission to within a second preset temperature range, and the input shaft speed of the automatic transmission is controlled according to the second rotation parameter, and the output shaft speed of the automatic transmission is controlled according to the second simulation parameter.

[0068] The second preset time is the time for the automatic transmission to self-heat to the second preset temperature range and perform the high temperature sealing test of the automatic transmission within the second temperature range. It can be set according to actual needs and is not limited here, such as 1h, 2h, 3h. The second rotation parameter includes but is not limited to the rotation speed of the input shaft of the automatic transmission, and the second simulation parameter includes but is not limited to the simulated vehicle speed used to simulate the vehicle driving process. The control parameters include but are not limited to the slip time and slip pressure of the clutch in the automatic transmission, as well as the main oil circuit pressure.

[0069] Specifically, by controlling the operating state of the clutch and the main oil circuit in the automatic transmission through the control parameters, the temperature of the automatic transmission and its environment can be raised to the second preset temperature at a set heating rate, so that the oil temperature of the automatic transmission rises to the second preset temperature range. The second preset temperature is the temperature reached by the self-heating of the automatic transmission. At this time, the vehicle can be in a high-speed driving mode; in this way, by controlling the input shaft speed of the automatic transmission through the second rotation parameter and the output shaft speed of the automatic transmission through the second simulation parameter, the operating state of the automatic transmission during high-speed driving of the vehicle can be simulated, so as to test the sealing of the automatic transmission in a high-temperature state. Exemplarily, the second preset temperature range can be (120±3)℃.

[0070] S60: Control the automatic transmission to stop rotating, and determine whether there is oil leakage at each sealing part of the automatic transmission.

[0071] Specifically, after the sealing test of the automatic transmission under low temperature and high temperature conditions is completed, the automatic transmission can be controlled to stop rotating. At this time, the input shaft speed and the output shaft speed can be controlled to be 0r / min, that is, the corresponding speed parameter is 0r / min, and the simulated vehicle speed is 0km / h. After the automatic transmission stops rotating, it can be determined whether there is oil leakage in each sealing part of the automatic transmission through observation by relevant experimenters, or it can also be determined whether there is oil leakage in each sealing part of the automatic transmission through the image information collected by the corresponding image collector. The embodiment of the present invention does not specifically limit the method of determining oil leakage.

[0072] S70. When it is determined that there is no oil leakage in each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

[0073] Specifically, if it is determined that there is no oil leakage in each sealing part of the automatic transmission, it can be determined that the sealing of the automatic transmission is good during this test. To ensure the accuracy of the test results, the sealing of the automatic transmission in high temperature environment and low temperature environment can be measured multiple times, that is, after a test is completed, the current test number can be obtained. If the current test number does not reach the preset test number, the automatic transmission can be controlled again to operate in a low temperature environment and a high temperature state, that is, the above S10~S60 are repeated until the test number reaches the preset test number. No oil leakage is found in each sealing part of the automatic transmission, then it can be determined that the various sealing components and assembly methods of the automatic transmission meet the requirements; if the automatic transmission is found to have oil leakage when the test number does not reach the preset test number, the test can be stopped to facilitate the test personnel to check the cause of the oil leakage of the automatic transmission. Among them, the preset test number can be set according to actual needs and is not limited here. For example, the preset test number can be 14.

[0074] The technical solution of the embodiment of the present invention controls the automatic transmission to be at a low temperature through a temperature regulating device, controls the clutch state of the automatic transmission, and controls the input shaft and output shaft of the automatic transmission to run at different speeds, so as to perform a low-temperature sealing test on the automatic transmission; further, by controlling the operating state of the clutch and the main oil circuit in the automatic transmission, and the input shaft and output shaft speeds of the automatic transmission, the automatic transmission is made to self-heat to a certain high temperature value, and controls the input shaft and output shaft of the automatic transmission to run at different speeds, so as to perform a low-temperature sealing test on the automatic transmission, so that the high and low temperature sealing test of the automatic transmission is closer to the state when the actual vehicle is running, thereby making the experimental results more accurate and improving the test accuracy of the automatic transmission.

[0075] Embodiment 2

[0076] Figure 2 This is a flow chart of a high and low temperature sealing test method for an automatic transmission provided in the second embodiment of the present invention. The technical solution of the embodiment of the present invention further explains the operating parameters, the first rotation parameter, the first simulation parameter, the control parameter, the second rotation parameter, and the second simulation parameter in the above embodiment, and further refines the high and low temperature sealing test method for the automatic transmission provided in the above embodiment. The same or similar terms in this embodiment and the above embodiment are not repeated.

[0077] like Figure 2 As shown, the high and low temperature sealing test method of the automatic transmission includes:

[0078] S10: After the automatic transmission is assembled, start the temperature regulating device to control the automatic transmission to cool down.

[0079] S20. When the temperature of the automatic transmission is stabilized within a first preset temperature range, an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter are obtained.

[0080] The operating parameters of the clutch of the automatic transmission include but are not limited to the lubrication flow, lubrication cycle and preset friction pressure of the clutch; the first rotation parameter includes but is not limited to the first rotation speed and the second rotation speed, the second rotation speed is greater than the first rotation speed; the first simulation parameter includes but is not limited to the first simulated vehicle speed and the second simulated vehicle speed, the second simulated vehicle speed is greater than the first simulated vehicle speed; the first preset time includes but is not limited to the first rotation time and the second rotation time, the second rotation time is located after the first rotation time. The first preset temperature range is a lower temperature range, for example, (-40±3)℃

[0081] S31. Within a first preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow according to a lubrication cycle, and the slip pressure of the clutch is controlled to be a preset slip pressure.

[0082] Among them, the lubrication flow rate, lubrication cycle and preset slip pressure of the clutch are the operating parameters of the clutch of the automatic transmission; the lubrication flow rate includes the maximum lubrication flow rate and the minimum lubrication flow rate, Figure 3 It is a schematic diagram of a clutch lubrication flow pulse waveform provided according to Example 2 of the present invention. As shown in the figure, during the lubrication cycle, the maximum lubrication flow is supplied and lasts for t1, and the minimum lubrication flow is supplied during the next t1 time. The specific number of times the maximum lubrication flow and the minimum lubrication flow alternate is adjusted according to the lubrication cycle; the preset sliding pressure can be set according to actual needs and is not limited here. For example, the preset sliding pressure is 0MPa.

[0083] Exemplarily, within a first preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow, and the slip pressure of the clutch is controlled to be a preset slip pressure of 0 MPa, so as to test the sealing of the automatic transmission when the slip pressure of the clutch is 0 MPa in a low temperature environment.

[0084] S32. During the first rotation time, the input shaft of the automatic transmission is controlled to rotate at a first rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the first simulated vehicle speed.

[0085] Among them, the first rotation time is the test time of low-temperature sealing performance when the automatic transmission runs at a lower speed, for example, the first rotation time is 1h; the first rotation speed includes but is not limited to the rotation speed of the automatic transmission input shaft, for example, the first rotation speed is 2000r / min; the first simulated vehicle speed includes but is not limited to the simulated vehicle speed during simulated vehicle driving, for example, the first simulated vehicle speed is 70km / h.

[0086] Illustratively, during the first rotation time, the input shaft of the automatic transmission is controlled to rotate at 2000r / min to simulate the power output of the engine when the automatic transmission is running at a lower speed; by simulating the vehicle speed during driving, the required rotation speed of the output shaft of the automatic transmission can be determined, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to 70km / h, thereby simulating the working state of the automatic transmission when the vehicle is running at a speed of 70km / h.

[0087] S33. During the second rotation time, the input shaft of the automatic transmission is controlled to rotate at a second rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the second simulated vehicle speed.

[0088] Among them, the second rotation time is the test time of the low-temperature sealing performance of the automatic transmission when running at a higher speed, for example, the second rotation time is 2h; the second rotation speed includes but is not limited to the rotation speed of the automatic transmission input shaft, for example, the second rotation speed is 3000r / min, and the second simulated vehicle speed includes but is not limited to the simulated vehicle speed during simulated vehicle driving, for example, the second simulated vehicle speed is 100km / h.

[0089] Exemplarily, during the second rotation time, the input shaft of the automatic transmission is controlled to rotate at 3000r / min to simulate the power output of the engine when the automatic transmission runs at a higher speed; the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the vehicle speed of 100km / h, so as to simulate the working state of the automatic transmission during vehicle driving.

[0090] S40, turning off the temperature adjustment device, acquiring a control parameter of the automatic transmission, a second rotation parameter of the automatic transmission, and a second simulation parameter.

[0091] Among them, the second rotation parameter includes but is not limited to the third rotation speed and the fourth rotation speed, the fourth rotation speed is greater than the third rotation speed; the second simulation parameter includes but is not limited to the third simulation speed and the fourth simulation speed, the fourth simulation speed is greater than the third simulation speed; the control parameters of the automatic transmission include but are not limited to the first slip cycle, the first slip pressure, the second slip cycle, the second slip pressure, the lubrication cycle and the lubrication flow, and the set pressure of the main oil circuit of the clutch; the second preset time includes but is not limited to the third rotation time and the fourth rotation time, the fourth rotation time is located after the third rotation time.

[0092] S51. During the third rotation time, the lubrication flow of the clutch is controlled to alternate between the maximum lubrication flow and the minimum lubrication flow with a lubrication cycle, the input shaft of the transmission is controlled to rotate at a third rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the third simulated vehicle speed, and the clutch slip is controlled with a first slip cycle and a first slip pressure, so that the automatic transmission is heated up to a second preset temperature range at a fixed slope.

[0093] Among them, the third rotation time is the time for the automatic transmission to self-heat to the second preset temperature range, which is adjusted according to the actual test conditions. During this period, the third simulated vehicle speed is higher than the second simulated vehicle speed in the second rotation time; the third rotation time is, for example, 1h, and the second preset temperature range is, for example, (120±3)℃; the third rotation speed includes but is not limited to the rotation speed of the automatic transmission input shaft, for example, the third rotation speed is 3000r / min; the third simulated vehicle speed includes but is not limited to the simulated vehicle speed during the simulated vehicle driving process, for example, the third simulated vehicle speed is 120km / h; the first slip cycle and the first slip pressure are control parameters of the automatic transmission.

[0094] Exemplarily, during the third rotation time, the input shaft of the transmission is controlled to rotate at 3000r / min, the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to 120km / h, and the clutch slip is controlled with the first slip cycle and the first slip pressure to simulate the actual operation of the vehicle. As the running time goes by, the temperature of the automatic transmission will slowly rise to the preset temperature, so that the automatic transmission will heat up to (120±3)℃ with a fixed slope.

[0095] In addition, the first slipping cycle includes slipping time and non-slipping time. Considering the actual vehicle working conditions, the clutch lubrication flow needs to be supplied when the clutch is slipping, that is, the clutch slipping moment needs to be coordinated with the clutch lubrication flow. During the slipping time of the first slipping cycle, the clutch lubrication flow is the maximum lubrication flow, and the maximum torque transmitted during slipping is less than or equal to the maximum transmittable torque specified by the automatic transmission design index; and during the non-slipping time of the first slipping cycle, the clutch lubrication flow can be the minimum lubrication flow; at this time, the time t1 when the clutch lubrication flow is the maximum lubrication flow in a lubrication cycle can be greater than or equal to the slipping time t2 of the first slipping cycle, and the slipping time t2 of the first slipping cycle is within the time t1 when the lubrication flow is the maximum lubrication flow. In an exemplary embodiment, t2<t1-2s.

[0096] S52. During the fourth rotation time, the lubrication flow of the clutch is controlled to alternate between the maximum lubrication flow and the minimum lubrication flow with a lubrication cycle, the input shaft of the transmission is controlled to rotate at a fourth rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to a fourth simulated vehicle speed, and the clutch is controlled to slip with a second slip cycle and a second slip pressure, and the pressure of the main oil circuit is controlled to be a set pressure, so that the temperature of the automatic transmission is stabilized within a second preset temperature range.

[0097] Among them, the fourth rotation time is the time for the high-temperature sealing test of the automatic transmission when the vehicle is running at a higher speed. During the fourth rotation time, the temperature of the automatic transmission will be maintained within the second preset range; the fourth rotation time can be 2h; the control parameters of the automatic transmission include but are not limited to the second slip cycle of the clutch, the second slip pressure, and the pressure of the main oil circuit; the fourth rotation speed includes but is not limited to the simulated vehicle speed during the simulated vehicle driving process, for example, the fourth rotation speed is 4500r / min; the fourth simulated vehicle speed includes but is not limited to the simulated vehicle speed during the simulated vehicle driving process, for example, the fourth simulated vehicle speed is 140km / h.

[0098] Exemplarily, during the fourth rotation time, the input shaft of the automatic transmission is controlled to rotate at 4500r / min to simulate the power output of the engine when the automatic transmission runs at a higher speed; the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to 140km / h to simulate the working state of the automatic transmission when the vehicle is traveling at a higher speed.

[0099] S60: Control the automatic transmission to stop rotating, and determine whether there is oil leakage at each sealing part of the automatic transmission.

[0100] S70. When it is determined that there is no oil leakage in each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

[0101] The technical solution of this embodiment controls the automatic transmission to be at a low temperature through a temperature regulating device, controls the clutch state of the automatic transmission, and controls the input shaft and output shaft of the automatic transmission to run at different speeds, so as to perform a low-temperature sealing test on the automatic transmission; further, by controlling the operating state of the clutch and the main oil circuit in the automatic transmission, and the speed of the input shaft and output shaft of the automatic transmission, the automatic transmission is made to self-heat to a certain high temperature value, and controls the input shaft and output shaft of the automatic transmission to run at different speeds, so as to perform a low-temperature sealing test on the automatic transmission. This makes the high and low temperature sealing test of the automatic transmission closer to the state of the actual vehicle during operation, thereby making the experimental results more accurate and improving the test accuracy of the automatic transmission.

[0102] Embodiment 3

[0103] Figure 4 1 is a flow chart of a method for testing the high and low temperature sealing performance of an automatic transmission according to the third embodiment of the present invention. The technical solution of the embodiment of the present invention provides an optional solution based on the above embodiment, which is to check the integrity of each sealing component of the automatic transmission and spray the developer before conducting the high and low temperature sealing performance test of the automatic transmission. The same or similar terms in this embodiment and the above embodiment are not repeated here.

[0104] like Figure 4 As shown, the method includes:

[0105] S11. Check the integrity of each seal of the automatic transmission.

[0106] Specifically, before assembling the automatic transmission, the integrity of each seal of the automatic transmission needs to be checked to avoid affecting the sealing test structure of the automatic transmission due to problems with the seal itself. The inspection method can be selected according to actual needs and is not limited here. For example, inspection by human eyes, or by taking a picture with an image collector and comparing it with a standard image.

[0107] S12. After confirming that the seals are intact, assemble the automatic transmission according to the automatic transmission design requirements.

[0108] Specifically, after confirming that the seals are intact, the various seals and driving components of the automatic transmission can be assembled together according to the design requirements of the automatic transmission to form a complete automatic transmission, and the assembled automatic transmission can be installed on an automatic transmission test bench to facilitate testing of the low-temperature and high-temperature sealing of the automatic transmission.

[0109] S13. After the assembly is completed, remove the surface attachments of the automatic transmission.

[0110] Specifically, in order to facilitate the assembly between the various components in the automatic transmission and between the transmission and the test bench, lubricants can be applied to the corresponding positions of the automatic transmission during the assembly process to reduce the assembly friction between the various components. After the automatic transmission is assembled, the lubricants and other attachments on the surface of the automatic transmission can be removed to ensure that the surface of the automatic transmission is clean, so as to reduce the interference of surface attachments on the test results.

[0111] S14. Spray developer on the joint surfaces between each sealing member of the automatic transmission and the housing of the automatic transmission, and air-dry the developer.

[0112] Specifically, since the high and low temperature sealing test results of the automatic transmission are determined by whether there is oil leakage on the surface of the automatic transmission, and considering that the oil used inside the automatic transmission is usually transparent, it is difficult to directly determine the leakage of the automatic transmission oil when there is oil leakage. Therefore, the developer can be sprayed on the joint surface between each seal of the automatic transmission and the outer shell of the automatic transmission. When oil leakage occurs, the sprayed developer can make the location of the leaking oil show a specific color, so as to observe the oil leakage and then determine the test results. Among them, after spraying the developer, the automatic transmission needs to be left to stand until the developer is air-dried. The standing time can be, for example, 1 hour or 2 hours. Under the premise that the developer can be air-dried, the embodiment of the present invention does not specifically limit the standing time.

[0113] S10: After the automatic transmission is assembled, start the temperature regulating device to control the automatic transmission to cool down.

[0114] S20. When the temperature of the automatic transmission is stabilized within a first preset temperature range, an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter are obtained.

[0115] S30. Within a first preset time, control the operating state of the clutch according to the operating parameter, control the input shaft speed of the automatic transmission according to the first rotation parameter, and control the output shaft speed of the automatic transmission according to the first simulation parameter.

[0116] S40, turning off the temperature adjustment device, acquiring a control parameter of the automatic transmission, a second rotation parameter of the automatic transmission, and a second simulation parameter.

[0117] S50. Within a second preset time, the operating states of the clutch and the main oil circuit in the automatic transmission are controlled according to the control parameters to heat the transmission to within a second preset temperature range, and the input shaft speed of the automatic transmission is controlled according to the second rotation parameter, and the output shaft speed of the automatic transmission is controlled according to the second simulation parameter.

[0118] S60: Control the automatic transmission to stop rotating, and determine whether there is oil leakage at each sealing part of the automatic transmission.

[0119] S70. When it is determined that there is no oil leakage in each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

[0120] The technical solution of this embodiment is to check whether each seal of the automatic transmission is intact to prevent the problem of the seal itself from affecting the sealing test of the automatic transmission; at the same time, after the automatic transmission is assembled, the developer can be sprayed on the joint surface between each seal of the automatic transmission and the outer shell of the automatic transmission to facilitate the subsequent determination of oil leakage.

[0121] Embodiment 4

[0122] Figure 5 1 is a flow chart of a method for testing the high and low temperature sealing performance of an automatic transmission according to the fourth embodiment of the present invention. The technical solution of the embodiment of the present invention provides an optional solution based on the above embodiment, which adds an automatic transmission running-in step before performing the high and low temperature sealing performance test of the automatic transmission. The same or similar terms in this embodiment and the above embodiment are not repeated here.

[0123] like Figure 5 As shown, the method includes:

[0124] S21. Adjust the temperature of the automatic transmission to a third preset temperature range, and obtain a running-in speed of the clutch and a running-in vehicle speed.

[0125] The temperature in the third preset temperature range is greater than the temperature in the first preset temperature range and less than the temperature in the second preset temperature range and can be set according to actual needs, and is not limited here. Usually, the third preset temperature range is room temperature. For example, the third preset temperature range is (25±3)°C.

[0126] Specifically, considering the actual working conditions of the automatic transmission, the automatic transmission needs to be run-in so that the internal components of the automatic transmission can reach the best working state, and the integrity of each seal of the automatic transmission can be checked through the run-in. By obtaining the run-in speed and run-in vehicle speed of the clutch, the automatic transmission can be further controlled to run-in.

[0127] S22. During the running-in time, the input shaft of the automatic transmission is controlled to rotate at a running-in speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the running-in vehicle speed.

[0128] The running-in time can be set according to actual needs and is not limited here, for example, 1h, 2h, 3h. The running-in speed and running-in vehicle speed are adjusted according to the actual situation of the clutch.

[0129] Specifically, the input shaft of the automatic transmission can match the power output of the engine. After the automatic transmission converts a certain proportion of the power output of the engine, it provides it to the vehicle's driving mechanism to make the vehicle travel at a certain speed. In this way, by controlling the rotation of the input shaft of the automatic transmission at a running-in speed, the power output of the engine can be simulated. By simulating the vehicle speed during driving, the required rotation speed of the output shaft of the automatic transmission can be determined. The output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the running-in speed, thereby simulating the running-in working state of the automatic transmission during vehicle operation.

[0130] Exemplarily, during the running-in period, the lubrication flow of the clutch is controlled to be 0 L / min, and the slip pressure is 0 MPa. At this time, the clutch is in a no-load state. The input shaft of the automatic transmission is controlled to rotate at 1000 r / min, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to 10 km / h, thereby allowing the automatic transmission to be run-in.

[0131] S10: After the automatic transmission is assembled, start the temperature regulating device to control the automatic transmission to cool down.

[0132] S20. When the temperature of the automatic transmission is stabilized within a first preset temperature range, an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter are obtained.

[0133] S30. Within a first preset time, control the operating state of the clutch according to the operating parameter, control the input shaft speed of the automatic transmission according to the first rotation parameter, and control the output shaft speed of the automatic transmission according to the first simulation parameter.

[0134] S40, turning off the temperature adjustment device, acquiring a control parameter of the automatic transmission, a second rotation parameter of the automatic transmission, and a second simulation parameter.

[0135] S50. Within a second preset time, the operating states of the clutch and the main oil circuit in the automatic transmission are controlled according to the control parameters to heat the transmission to within a second preset temperature range, and the input shaft speed of the automatic transmission is controlled according to the second rotation parameter, and the output shaft speed of the automatic transmission is controlled according to the second simulation parameter.

[0136] S60: Control the automatic transmission to stop rotating, and determine whether there is oil leakage at each sealing part of the automatic transmission.

[0137] S70. When it is determined that there is no oil leakage in each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

[0138] The technical solution of the embodiment of the present invention is based on the high and low temperature sealing test of the automatic transmission assembly. On the basis of the technical solution provided by the above embodiment, considering that the automatic transmission needs to be run-in, an optional solution is proposed. Before the high and low temperature sealing test of the automatic transmission is carried out, the automatic transmission is run-in tested so that the internal components of the automatic transmission reach the best working state, and the integrity of each seal of the automatic transmission is checked. The technical solution of the embodiment of the present invention, based on the technical effect achieved by the above embodiment, further solves the problem of whether the various seals of the automatic transmission are intact and the impact on the high and low temperature sealing test of the automatic transmission due to the failure of the automatic transmission to be run-in.

[0139] Embodiment 5

[0140] Figure 6 It is a structural schematic diagram of a high and low temperature sealing test system for an automatic transmission provided according to embodiment five of the present invention. The high and low temperature sealing test system for an automatic transmission can be used to execute the high and low temperature sealing test method for an automatic transmission provided by any embodiment of the present invention, and has software and / or hardware for executing the high and low temperature sealing test method for an automatic transmission provided by any embodiment of the present invention.

[0141] like Figure 6 As shown, the high and low temperature sealing test system 01 of the automatic transmission includes: a temperature control box 10 , a drive dynamometer 20 , a first drive shaft 30 , at least one load dynamometer, at least one second drive shaft and a test bench controller 60 .

[0142] Among them, a temperature control box 10 is provided with a temperature regulating device 11, which can be an air conditioner, etc. The temperature control box 10 is used to place the automatic transmission 12 to be tested, and the automatic transmission 12 to be tested can be placed in the temperature control box 10; the drive dynamometer 20 is connected to the input shaft of the automatic transmission through the first drive shaft 30, and the drive dynamometer 20 can be equivalent to the engine in the vehicle, etc.; each load dynamometer 40 is connected to each output shaft of the automatic transmission through each second drive shaft 50, and the load dynamometer can be equivalent to the driving mechanism in the vehicle, etc. The number of load dynamometers can be one or more, which can be determined according to the actual application scenario of the automatic transmission 12 to be tested, and the embodiment of the present invention does not specifically limit this; the test bench controller 60 is electrically connected to the temperature regulating device 11, the drive dynamometer 20, and each load dynamometer 40 respectively; the test bench controller 10 is used to control the operating status of the temperature regulating device 11, the drive dynamometer 20, and each load dynamometer 40.

[0143] Optionally, the high and low temperature sealing test system of the automatic transmission further includes: an industrial computer. The test bench controller 60 is in communication connection with the industrial computer. The industrial computer can be used by the test personnel to send instructions to the test bench controller 60 and obtain test parameters during the high and low temperature sealing test of the automatic transmission.

[0144] An automatic transmission high and low temperature sealing test system provided by an embodiment of the present invention can execute an automatic transmission high and low temperature sealing test method provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

[0145] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0146] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high and low temperature sealing test method for an automatic transmission, characterized in that: include: S10, after the automatic transmission is assembled, starting a temperature regulating device to control the automatic transmission to cool down; S20, when the temperature of the automatic transmission is stable within a first preset temperature range, obtaining an operating parameter of a clutch of the automatic transmission, a first rotation parameter of the automatic transmission, and a first simulation parameter; wherein the operating parameter of the clutch of the automatic transmission is a parameter related to lubricating oil matching and clutch state during clutch operation; S30, within a first preset time, controlling the operating state of the clutch according to the operating parameter, controlling the input shaft speed of the automatic transmission according to the first rotation parameter, and controlling the output shaft speed of the automatic transmission according to the first simulation parameter; S40, turning off the temperature regulating device, acquiring the control parameter of the automatic transmission, the second rotation parameter of the automatic transmission and the second simulation parameter; wherein the control parameter of the automatic transmission includes the slip time and slip pressure of the clutch in the automatic transmission, and the main oil circuit pressure; S50, within a second preset time, controlling the operating states of the clutch and the main oil circuit in the automatic transmission according to the control parameter to heat the transmission to a second preset temperature range, and controlling the input shaft speed of the automatic transmission according to the second rotation parameter, and controlling the output shaft speed of the automatic transmission according to the second simulation parameter; S60, controlling the automatic transmission to stop rotating, and determining whether there is oil leakage at each sealing part of the automatic transmission; S70. When it is determined that there is no oil leakage at each sealing part of the automatic transmission, obtain the current test number, and when the test number does not reach the preset test number, repeat S10 to S60.

2. The high and low temperature sealing test method of an automatic transmission according to claim 1, characterized in that: The operating parameters include the lubrication flow rate, lubrication cycle and preset sliding friction pressure of the clutch; the first rotation parameter includes a first rotation speed and a second rotation speed; the second rotation speed is greater than the first rotation speed; the first simulation parameter includes a first simulated vehicle speed and a second simulated vehicle speed; the second simulated vehicle speed is greater than the first simulated vehicle speed; the first preset time includes a first rotation time and a second rotation time; The second rotation time is after the first rotation time; S30 specifically includes: During the first preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow according to the lubrication cycle, and the slip pressure of the clutch is controlled to be the preset slip pressure; the preset slip pressure is 0 MPa; During the first rotation time, controlling the input shaft of the automatic transmission to rotate at the first rotation speed, and controlling the output shaft of the automatic transmission to rotate at a rotation speed corresponding to the first simulated vehicle speed; During the second rotation time, the input shaft of the automatic transmission is controlled to rotate at the second rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the second simulated vehicle speed.

3. The high and low temperature sealing test method of an automatic transmission according to claim 1, characterized in that: The second rotation parameter includes a third rotation speed and a fourth rotation speed; the fourth rotation speed is greater than the third rotation speed; the second simulation parameter includes a third simulation speed and a fourth simulation speed; the fourth simulation speed is greater than the third simulation speed; the control parameter includes a first slip cycle, a first slip pressure, a second slip cycle, a second slip pressure, a lubrication cycle and a lubrication flow rate of the clutch, and a set pressure of the main oil circuit; the second preset time includes a third rotation time and a fourth rotation time; The fourth rotation time is located after the third rotation time; S50 specifically includes: During the second preset time, the lubrication flow of the clutch is controlled to alternate between a maximum lubrication flow and a minimum lubrication flow according to the lubrication cycle; During the third rotation time, the input shaft of the transmission is controlled to rotate at the third rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a rotation speed corresponding to the third simulated vehicle speed, and the clutch is controlled to slip with the first slip cycle and the first slip pressure, so that the automatic transmission is heated up to within the second preset temperature range at a fixed slope; During the fourth rotation time, the input shaft of the transmission is controlled to rotate at the fourth rotation speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the fourth simulated vehicle speed, and the clutch is controlled to slip with the second slip cycle and the second slip pressure, and the pressure of the main oil circuit is controlled to be the set pressure, so that the temperature of the automatic transmission is stabilized within the second preset temperature range.

4. The high and low temperature sealing test method of an automatic transmission according to claim 3, characterized in that: The first sliding cycle and the second sliding cycle both include sliding time and non-slip time; the sliding time is within the time when the lubrication flow of the clutch in each lubrication cycle is the maximum lubrication flow.

5. The high and low temperature sealing test method of an automatic transmission according to claim 1, characterized in that: Prior to S10, this also included: Performing integrity inspection on each seal of the automatic transmission; After confirming that the seal is intact, assembling the automatic transmission according to the design requirements of the automatic transmission; After the assembly is completed, the automatic transmission is subjected to surface treatment.

6. The high and low temperature sealing test method of an automatic transmission according to claim 5, characterized in that: After the assembly is completed, the automatic transmission is subjected to surface treatment, including: After the assembly is completed, removing the surface attachments of the automatic transmission; A developer is sprayed on the joint surfaces of each seal of the automatic transmission and the housing of the automatic transmission, and the developer is air-dried.

7. The high and low temperature sealing test method of an automatic transmission according to claim 1, characterized in that: Prior to S10, this also included: Adjusting the temperature of the automatic transmission to a third preset temperature range, and acquiring the running-in speed and running-in vehicle speed of the clutch; wherein the temperature within the third preset temperature range is greater than the temperature within the first preset temperature range and less than the temperature within the second preset temperature range; During the running-in time, the input shaft of the automatic transmission is controlled to rotate at the running-in speed, and the output shaft of the automatic transmission is controlled to rotate at a speed corresponding to the running-in vehicle speed.

8. The high and low temperature sealing test method of an automatic transmission according to claim 7, characterized in that: Also includes: During the running-in time, the lubrication flow rate of the clutch is controlled to be 0 L / min, and the slip pressure of the clutch is controlled to be 0 MPa.

9. A high and low temperature sealing performance test system for an automatic transmission, used to perform the high and low temperature sealing performance test method for an automatic transmission according to any one of claims 1 to 8, characterized in that: include: a temperature control box, a drive dynamometer, a first drive shaft, at least one load dynamometer, at least one second drive shaft, and a test bench controller; The temperature control box is provided with a temperature regulating device; the temperature control box is used to place the automatic transmission to be tested; The driving dynamometer is connected to the input shaft of the automatic transmission via the first driving shaft; Each of the load dynamometers is connected to each output shaft of the automatic transmission via each of the second drive shafts; The test bench controller is electrically connected to the temperature regulating device, the drive dynamometer, and each of the load dynamometers respectively; the test bench controller is used to control the operating status of the temperature regulating device, the drive dynamometer, and each of the load dynamometers.

10. The high and low temperature sealing test system of the automatic transmission according to claim 9, characterized in that: Also includes: Industrial computer; The test bench controller is communicatively connected with the industrial computer.

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