Test method, device, readable storage medium and processor for a clutch

Abstract

The application discloses a kind of test method, device, readable storage medium and processor of clutch.The method comprises: obtaining test instruction for testing to be tested clutch;In response to test instruction, control clutch test equipment to be tested clutch is run-in test, and initial test result is obtained, wherein initial test result is used to characterize the working state of to be tested clutch, from original working state to stable working state;In stable working state, the spring pressure and torque of to be tested clutch in at least one to be tested working condition are obtained;Based on spring pressure and torque, determine the target test result of to be tested clutch, wherein target test result at least includes the performance index parameter of to be tested clutch.The application solves the technical problem that clutch friction coefficient cannot be tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device testing, in particular to a test method and device for a clutch, a readable storage medium and a processor. BACKGROUND

[0002] The clutch is a core component of a transmission, and its performance index parameters are also crucial for transmission control. However, due to product development cycle, measurement technology means and other factors, the clutch friction coefficient cannot be tested.

[0003] In view of the above technical problem that the clutch friction coefficient cannot be tested, no effective solution has been proposed so far. SUMMARY

[0004] The embodiments of the present application provide a test method and device for a clutch, a readable storage medium and a processor, which at least solve the technical problem that the clutch friction coefficient cannot be tested.

[0005] According to an aspect of the embodiments of the present application, a test method for a clutch is provided. The method can include: obtaining a test instruction for testing a to-be-tested clutch; in response to the test instruction, controlling a clutch test device to perform a running-in test on the to-be-tested clutch to obtain an initial test result, wherein the initial test result is used to represent a working state of the to-be-tested clutch, which is switched from an original working state to a stable working state; in the stable working state, obtaining a spring pressure and a torque of the to-be-tested clutch under at least one to-be-tested working condition; and determining a target test result of the to-be-tested clutch based on the spring pressure and the torque, wherein the target test result at least includes a performance index parameter of the to-be-tested clutch.

[0006] Optionally, the controlling of the clutch test device to perform the running-in test on the to-be-tested clutch to obtain the initial test result includes: adjusting a speed difference between a driving end and a driven end of the to-be-tested clutch from an original speed difference to a reference speed difference, and adjusting the spring pressure from an original pressure to a reference pressure; controlling the clutch test device to perform multiple pressurization cycles on the to-be-tested clutch based on the reference speed difference and the reference pressure, to obtain multiple sliding friction work done by the to-be-tested clutch in the process of the pressurization cycles and multiple target torques of the to-be-tested clutch in the pressurization cycles; and obtaining the initial test result based on the multiple sliding friction work and the multiple target torques.

[0007] Optionally, the initial test result is obtained based on the plurality of sliding friction work and the plurality of target torques, including: determining a torque change amount of the to-be-tested clutch under a unit sliding friction work based on a target sliding friction work in the plurality of sliding friction work and a first target torque and a second target torque in the plurality of target torques, wherein a first time at which the to-be-tested clutch transmits the first target torque is earlier than a second time at which the to-be-tested clutch generates the second target torque, and the target sliding friction work is work done by the to-be-tested clutch at the second time; and obtaining the initial test result in response to the torque change amount being less than or equal to a change amount threshold.

[0008] Optionally, the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained in the stable working state, including: determining a plurality of to-be-tested pressures for testing the spring pressure of the to-be-tested clutch in the stable working state, wherein the plurality of to-be-tested pressures are sorted in an increasing manner; applying the plurality of to-be-tested pressures to the to-be-tested clutch in an increasing manner under the at least one to-be-tested working condition to obtain a plurality of test torques transmitted by the to-be-tested clutch under the plurality of to-be-tested pressures, wherein the plurality of to-be-tested pressures are associated with the plurality of test torques; and determining the spring pressure and the torque based on the plurality of test torques.

[0009] Optionally, the spring pressure and the torque are determined based on the plurality of test torques, including: determining a to-be-tested pressure corresponding to a test torque in the plurality of to-be-tested pressures as the spring pressure in response to a difference or a ratio between the test torque and a test torque threshold in the plurality of test torques being greater than or equal to a target threshold; and determining the torque based on the spring pressure.

[0010] Optionally, the torque is determined based on the spring pressure, including: applying the spring pressure to the to-be-tested clutch in a target time period; and updating the spring pressure to a target spring pressure in a time period after the target time period to obtain the torque of the to-be-tested clutch in the stable working state, wherein the target spring pressure is less than the spring pressure.

[0011] According to an aspect of an embodiment of the present application, a testing device for a clutch is provided, which can include: a first obtaining unit configured to obtain a test instruction for testing a to-be-tested clutch; a running-in test unit configured to control a clutch test device to perform a running-in test on the to-be-tested clutch in response to the test instruction to obtain an initial test result, wherein the initial test result is used to represent a working state of the to-be-tested clutch, which is switched from an original working state to a stable working state; a second obtaining unit configured to obtain a spring pressure and a torque of the to-be-tested clutch under at least one to-be-tested working condition in the stable working state; and a determining unit configured to determine a target test result of the to-be-tested clutch based on the spring pressure and the torque, wherein the target test result at least includes a performance index parameter of the to-be-tested clutch.

[0012] According to another aspect of the embodiments of the present application, a computer readable storage medium is provided, which includes a stored program. When the program is run, the computer readable storage medium controls the device where the computer readable storage medium is located to perform the test method of the clutch according to the embodiments of the present application.

[0013] According to another aspect of the embodiments of the present application, a processor is provided. The processor is configured to run a program. When the program is run, the processor performs the test method of the clutch according to the embodiments of the present application.

[0014] According to another aspect of the embodiments of the present application, a vehicle is provided. The vehicle is configured to perform the test method of the clutch according to the embodiments of the present application.

[0015] In the embodiments of the present application, a test instruction for testing the clutch to be tested is obtained. In response to the test instruction, a running-in test of the clutch to be tested is performed by a clutch test device, and an initial test result is obtained. The initial test result is used to represent a working state of the clutch to be tested, which is switched from an original working state to a stable working state. In the stable working state, a spring pressure and a torque of the clutch to be tested under at least one test working condition are obtained. Based on the spring pressure and the torque, a target test result of the clutch to be tested is determined. The target test result at least includes a performance index parameter of the clutch to be tested. That is, in the embodiments of the present application, the running-in test of the clutch to be tested is performed by the clutch test device, so that the working state of the clutch to be tested is switched from the original working state to the stable working state. Then, the spring pressure and the torque of the clutch to be tested under at least one test working condition are obtained. Finally, the target test result of the clutch to be tested is determined according to the obtained spring pressure and torque. Thus, the technical problem that the friction coefficient of the clutch cannot be tested is solved, and the technical effect that the friction coefficient of the clutch can be tested is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate certain illustrative embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0017] Figure 1 FIG. 1 is a flowchart of a test method of a clutch according to an embodiment of the present application;

[0018] Figure 2 FIG. 2 is a flowchart of a test method of a friction factor of a clutch according to an embodiment of the present application;

[0019] Figure 3 FIG. 3 is a schematic diagram of a device structure for a running-in test according to an embodiment of the present application;

[0020] Figure 4is a schematic diagram of a break-in phase clutch pressure according to an embodiment of the application;

[0021] Figure 5 is a schematic diagram of a test device for a clutch according to an embodiment of the application. DETAILED DESCRIPTION

[0022] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely in combination with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all. Based on the embodiment in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0023] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] Embodiment 1

[0025] According to the embodiment of the present application, a test method for a clutch is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that herein.

[0026] The test method for the clutch according to the embodiment of the present application will be described below.

[0027] Figure 1 is a flowchart of a test method for a clutch according to an embodiment of the present application, as shown in Figure 1 The method can include the following steps:

[0028] Step S101, obtaining a test instruction for testing the to-be-tested clutch.

[0029] In the technical solution provided in the step S101 of the present application, the test instruction for testing the to-be-tested clutch can be obtained, wherein the to-be-tested clutch can be a clutch waiting for testing, the clutch can be used for controlling the starting of a vehicle and facilitating gear shifting of the vehicle and is a core component of a transmission, the test instruction can be a test instruction for break-in testing of the to-be-tested clutch, and for example, the test instruction can be a test instruction for break-in testing of the to-be-tested clutch.

[0030] Optionally, the to-be-tested clutch can be a clutch of which the quality is detected offline and is qualified, and the to-be-tested clutch is not limited herein.

[0031] In the step S102, the break-in testing of the to-be-tested clutch is controlled by using the clutch testing device in response to the test instruction, and an initial test result is obtained, wherein the initial test result is used for representing the working state of the to-be-tested clutch and switching from an original working state to a stable working state.

[0032] In the technical solution provided in the step S102 of the present application, after the test instruction for testing the to-be-tested clutch is obtained, the break-in testing of the to-be-tested clutch is controlled by using the clutch testing device in response to the test instruction, and an initial test result is obtained, wherein the initial test result can be used for representing the working state of the to-be-tested clutch and switching from an original working state to a stable working state.

[0033] In this embodiment, the clutch testing device can be a testing bench, and the break-in testing can be a break-in testing for testing the clutch friction factor of the to-be-tested clutch.

[0034] In this embodiment, the automatic transmission in which the to-be-tested clutch is installed can be installed on the clutch testing device to simulate a real vehicle state, and then the automatic transmission is respectively engaged in odd / even gear positions, so that the odd / even clutch rotation speed can be controlled by using a loading device to achieve the purpose of break-in testing of the to-be-tested clutch, thereby obtaining the initial test result.

[0035] Optionally, in this embodiment, the rotation speed difference between the driving end and the driven end of the to-be-tested clutch can be adjusted from an original rotation speed difference to a reference rotation speed difference, the spring pressure can be adjusted from an original pressure to a reference pressure, and the clutch testing device is controlled to perform multiple pressurization cycles on the to-be-tested clutch, so as to obtain multiple sliding friction work and multiple target torques of the to-be-tested clutch in the cycles, thereby obtaining the initial test result.

[0036] In the step S103, the spring pressure and the torque of the to-be-tested clutch in at least one to-be-tested working condition are obtained in the stable working state.

[0037] In the technical solution provided in the step S103 of the present application, after the initial test result is obtained by controlling the clutch test device to perform the running-in test on the to-be-tested clutch in response to the test instruction, the working state of the to-be-tested clutch is determined to be switched from the original working state to the stable working state, and then the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained in the stable working state. For example, the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition in the stable working state are obtained.

[0038] In this embodiment, the spring pressure can be represented by P0, and the torque can be represented by T P .

[0039] In this embodiment, when the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained in the stable working state, a plurality of to-be-tested pressures can be applied to the to-be-tested clutch in an incremental manner under the to-be-tested working condition, so as to obtain a plurality of test torques under the plurality of to-be-tested pressures, thereby determining the spring pressure and the torque.

[0040] It should be noted that this is only one preferred embodiment for obtaining the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition, and the process and method for obtaining the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are not specifically limited herein, and all processes and methods for obtaining the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are within the protection scope of the present application, and are not listed one by one herein.

[0041] In the step S104 of the present application, the target test result of the to-be-tested clutch is determined based on the spring pressure and the torque, wherein the target test result at least includes the performance index parameter of the to-be-tested clutch.

[0042] In the technical solution provided in the step S104 of the present application, after the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained in the stable working state, the target test result of the to-be-tested clutch is determined according to the obtained spring pressure and torque, wherein the target test result at least includes the performance index parameter of the to-be-tested clutch. For example, the clutch friction coefficient μ of the to-be-tested clutch is determined according to the obtained spring pressure P0 and torque T P .

[0043] In this embodiment, the performance index parameter of the to-be-tested clutch can be the clutch friction coefficient, and the clutch friction coefficient can be calculated by the following formula:

[0044]

[0045] In the above formula, μ represents the clutch friction coefficient, P represents the clutch pressure measurement value, P0 represents the clutch spring pressure, T P represents the transmission input shaft torque measurement value when the clutch pressure is P, T0 represents the transmission input shaft torque measurement value under the clutch spring pressure, S represents the clutch piston cross-sectional area, R represents the clutch friction plate equivalent radius, and n represents the number of clutch friction plates.

[0046] The steps S101 to S104 described above of the present application, the test instruction for testing the to-be-tested clutch is obtained; in response to the test instruction, the clutch test device is controlled to perform a running-in test on the to-be-tested clutch, and an initial test result is obtained, wherein the initial test result is used to represent the working state of the to-be-tested clutch, and the working state is switched from an original working state to a stable working state; in the stable working state, the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained; and based on the spring pressure and the torque, a target test result of the to-be-tested clutch is determined, wherein the target test result at least includes a performance index parameter of the to-be-tested clutch. That is to say, the embodiment of the present application controls the clutch test device to perform a running-in test on the to-be-tested clutch, so that the working state of the to-be-tested clutch is switched from an original working state to a stable working state, and then the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained, and finally the target test result of the to-be-tested clutch is determined according to the obtained spring pressure and torque, thereby solving the technical problem that the clutch friction coefficient cannot be tested, and achieving the technical effect that the clutch friction coefficient can be tested.

[0047] The above method of the embodiment will be further introduced below.

[0048] As an optional embodiment, in step S102, the initial test result obtained by controlling the clutch test device to perform a running-in test on the to-be-tested clutch includes: adjusting the speed difference between the driving end and the driven end of the to-be-tested clutch from an original speed difference to a reference speed difference, and adjusting the spring pressure from an original pressure to a reference pressure; controlling the clutch test device to perform multiple pressurization cycles on the to-be-tested clutch based on the reference speed difference and the reference pressure, obtaining multiple sliding friction works performed by the to-be-tested clutch in the process of the pressurization cycles, and multiple target torques of the to-be-tested clutch in the pressurization cycles; and obtaining the initial test result based on the multiple sliding friction works and the multiple target torques.

[0049] In this embodiment, after obtaining the test instruction for testing the clutch to be tested, the rotational speed difference between the driving end and the driven end of the clutch to be tested is adjusted from the original rotational speed difference to a reference rotational speed difference, and the spring pressure is adjusted from the original pressure to a reference pressure in response to the test instruction, and then the clutch test device is controlled to perform multiple pressurization cycles on the clutch to be tested based on the reference rotational speed difference and the reference pressure, to obtain multiple sliding friction powers made by the clutch to be tested in the process of the pressurization cycles and multiple target torques of the clutch to be tested in the pressurization cycles, and finally the initial test result is obtained based on the multiple sliding friction powers and the multiple target torques.

[0050] In this embodiment, the reference rotational speed difference can be represented by S1, the reference pressure can be represented by P1, the multiple pressurization cycles can be represented by N1, N2 and N3, the sliding friction power can be represented by W, and the multiple target torques can be represented by T1, T2, T3 and T4.

[0051] In this embodiment, the rotational speed difference between the driving end and the driven end of the clutch to be tested can be adjusted from the original rotational speed difference to a reference rotational speed difference, and the spring pressure can be adjusted from the original pressure to a reference pressure, so as to control the clutch test device to perform multiple pressurization cycles on the clutch to be tested, to obtain multiple sliding friction powers made by the clutch to be tested in the process and multiple target torques, so as to achieve the purpose of obtaining the initial test result.

[0052] For example, the test bench can be adjusted so that the rotational speed difference between the driving end and the driven end of the clutch is S1, the clutch pressure is P1, and the torque transmitted by the clutch is recorded as T1; the rotational speed difference of the clutch is adjusted to S1, the clutch pressure is adjusted, N1 pressurization cycles are completed, the sliding friction power made by the clutch in the N1 pressurization cycles is calculated as W, and the torque transmitted by the clutch in the N1 cycle is recorded as T2; the rotational speed difference of the clutch is adjusted to S1, the clutch pressure is adjusted, and the clutch pressurization cycle is performed, when the sliding friction power W is generated, the pressurization is stopped and the cycle number N2 of the clutch pressurization at this time is recorded, and the torque transmitted by the clutch in the N2 cycle is recorded as T3; the rotational speed difference of the clutch is adjusted to S1, the clutch pressure is adjusted, and the clutch pressurization cycle is performed, when the sliding friction power W is generated, the pressurization is stopped and the cycle number N3 of the clutch pressurization at this time is recorded, and the torque transmitted by the clutch in the N3 cycle is recorded as T4; and the initial test result is obtained based on the multiple sliding friction powers and the multiple target torques.

[0053] As an optional embodiment, based on the plurality of sliding friction work and the plurality of target torques, the initial test result is obtained, including: based on a target sliding friction work in the plurality of sliding friction work, and a first target torque and a second target torque in the plurality of target torques, determining a torque change amount of the to-be-tested clutch under unit sliding friction work, wherein a first time at which the to-be-tested clutch transmits the first target torque is earlier than a second time at which the to-be-tested clutch generates the second target torque, and the target sliding friction work is work done by the to-be-tested clutch at the second time; and in response to the torque change amount being less than or equal to a change amount threshold, obtaining the initial test result.

[0054] In this embodiment, the to-be-tested clutch can be controlled to perform a plurality of pressurization cycles based on the reference speed difference and the reference pressure, and a plurality of sliding friction work done by the to-be-tested clutch during the pressurization cycles and a plurality of target torques of the to-be-tested clutch during the pressurization cycles are obtained. Then, based on a target sliding friction work in the plurality of sliding friction work and a first target torque and a second target torque in the plurality of target torques, a torque change amount of the to-be-tested clutch under unit sliding friction work is determined. If the torque change amount is less than or equal to a change amount threshold, an initial test result can be obtained, that is, the working state of the to-be-tested clutch is switched from an original working state to a stable working state.

[0055] In this embodiment, the torque change amount under unit sliding friction work can be calculated and obtained according to the obtained target torque and sliding friction work of the clutch. The calculation formula can be k1=(T2-T1) / W, k2=(T3-T2) / W, k3=(T4-T3) / W, etc. This is only an example and is not limited in detail. The change amount threshold can be a threshold k min .

[0056] For example, the test bench can be adjusted so that the difference between the driving end and driven end rotational speeds of the clutch is S1, the clutch pressure is P1, and the torque transmitted by the clutch is recorded as T1; the clutch rotational speed difference is adjusted to S1, and the clutch pressure is adjusted, N1 pressure cycles are completed, the friction work done by the clutch in the N1 pressure cycles is calculated as W, the torque transmitted by the clutch in the N1 cycle is recorded as T2, and the torque change k1 = (T2-T1) / W; the clutch rotational speed difference is adjusted to S1, and the clutch pressure is adjusted, and the clutch pressure cycle is performed, and when the friction work done is W, the pressure is stopped and the number of pressure cycles N2 of the clutch at this time is recorded, the torque transmitted by the clutch in the N2 cycle is recorded as T3, and the torque change k2 = (T3-T2) / W; the clutch rotational speed difference is adjusted to S1, and the clutch pressure is adjusted, and the clutch pressure cycle is performed, and when the friction work done is W, the pressure is stopped and the number of pressure cycles N3 of the clutch at this time is recorded, the torque transmitted by the clutch in the N3 cycle is recorded as T4, and the torque change k3 = (T4-T3) / W; the above process is repeated until the obtained k value is less than or equal to the threshold value k min At this time, the running-in test is completed, and the initial test result can be determined.

[0057] As an optional embodiment, in the stable working state, the spring pressure and torque of the clutch to be tested under at least one working condition are obtained, including: in the stable working state, a plurality of test pressures for testing the spring pressure of the clutch to be tested are determined, wherein the plurality of test pressures are sorted in an increasing manner; under at least one working condition, the plurality of test pressures are applied to the clutch to be tested in an increasing manner, and a plurality of test torques transmitted by the clutch to be tested under the plurality of test pressures are obtained, wherein the plurality of test pressures are associated with the plurality of test torques; and the spring pressure and torque are determined based on the plurality of test torques.

[0058] In this embodiment, after the running-in test of the clutch to be tested is performed by the clutch test device in response to the test instruction and the initial test result is obtained, a plurality of test pressures for testing the spring pressure of the clutch to be tested are determined in the stable working state, then the plurality of test pressures are applied to the clutch to be tested in an increasing manner under at least one working condition, a plurality of test torques transmitted by the clutch to be tested under the plurality of test pressures are obtained, and the spring pressure and torque are determined based on the plurality of test torques, wherein the plurality of test pressures are sorted in an increasing manner, and the plurality of test pressures are associated with the plurality of test torques, i.e., the test pressure corresponds to the test torque one by one.

[0059] In this embodiment, the plurality of to-be-tested pressures can be selected in an incremental manner starting from 0 mega pascal (MPa), the plurality of test torques can be the transmission input end torque values of the clutch under different pressures, and the association between the plurality of to-be-tested pressures and the plurality of test torques can be a one-to-one correspondence between the plurality of to-be-tested pressures and the plurality of test torques.

[0060] As an optional embodiment, determining the spring pressure and the torque based on the plurality of test torques includes: in response to a difference or a ratio between at least one test torque in the plurality of test torques and a test torque threshold being greater than or equal to a target threshold, determining a to-be-tested pressure corresponding to the test torque in the plurality of to-be-tested pressures as the spring pressure; and determining the torque based on the spring pressure.

[0061] In this embodiment, after the plurality of to-be-tested pressures are applied to the to-be-tested clutch in an incremental manner under at least one to-be-tested working condition to obtain the plurality of test torques transmitted by the to-be-tested clutch under the plurality of to-be-tested pressures, if a difference or a ratio between at least one test torque in the plurality of test torques and a test torque threshold is greater than or equal to a target threshold, a to-be-tested pressure corresponding to the test torque in the plurality of test pressures can be determined as the spring pressure, and the torque of the to-be-tested clutch under the at least one to-be-tested working condition can be determined according to the spring pressure.

[0062] In this embodiment, the test torque threshold can be a drag torque value, and the target threshold can be a pre-set threshold, for example, 10 newton meters (Nm). Here, only the test torque threshold and the target threshold are exemplified, and the test torque threshold and the target threshold are not specifically limited.

[0063] For example, the clutch speed difference S' can be controlled, and the drag torque value after stable operation is recorded; the clutch target pressure is selected in an incremental manner starting from 0 MPa, and the odd / even clutch pressure is stepped up to each target pressure until the transmission input end torque value is greater than the drag torque value by 10 Nm, the clutch pressure at this time is recorded, that is, the clutch spring pressure P0 under the working condition, and the torque transmitted at this time is recorded as T0.

[0064] As an optional embodiment, determining the torque based on the spring pressure includes: applying the spring pressure to the to-be-tested clutch within a target time period; and updating the spring pressure to a target spring pressure within a time period after the target time period to obtain the torque of the to-be-tested clutch in a stable working state, where the target spring pressure is less than the spring pressure.

[0065] In this embodiment, after the difference or ratio between at least one of the test torques and the test torque threshold is greater than or equal to the target threshold, the spring pressure corresponding to the test torque among the plurality of test pressures can be determined as the spring pressure, then the spring pressure can be updated to the target spring pressure in a target time period, and the torque of the test clutch in the stable working state can be obtained, wherein the target time period can be a preset time period, and the target spring pressure can be 0. s The target time period can be represented by t

[0066] For example, when the clutch friction coefficient test is performed, the clutch speed difference S can be controlled, the clutch pressure P can be set, and the time period t s The clutch pressure can be set to zero, and the torque value T P can be recorded after the operation is stable.

[0067] In this embodiment, the test clutch is tested by the clutch test device to switch the working state of the test clutch from the original working state to the stable working state, and then the spring pressure and the torque of the test clutch under at least one test working condition are obtained, and finally the target test result of the test clutch is determined according to the obtained spring pressure and torque, thereby solving the technical problem that the clutch friction coefficient cannot be tested, and achieving the technical effect that the clutch friction coefficient can be tested.

[0068] Embodiment 2

[0069] The technical solutions of the embodiments of the present application will be illustrated below in combination with preferred embodiments.

[0070] At present, in the field of automatic transmission technology, especially a transmission clutch friction factor test method and system. The clutch is the core component of the transmission, and the clutch friction factor is an important parameter for clutch control. The test result precision and full working condition scanning of the transmission clutch friction factor are particularly important, but limited by product development cycle, measurement technology means and other factors, the clutch friction factor test is mostly carried out at the component level in the development stage, and the clutch friction coefficient test method at the transmission assembly level is less, thereby causing the technical problem that the clutch friction coefficient cannot be tested. Therefore, in order to solve the above problems, the present application provides a test method for clutch, so as to realize the technical effect that the clutch friction coefficient can be tested.

[0071] Figure 2 is a flow chart of a clutch friction factor test method according to an embodiment of the present application, as shown in Figure 2 which can include the following steps:

[0072] Step S201, checking the state of the sample to be tested.

[0073] In this embodiment, the automatic transmission checks the state of the sample to be tested, and the sample to be tested should be a sample that has passed the off-line detection and whose control valve block needs to complete the basic bench calibration.

[0074] Step S202, controlling the transmission through the loading device.

[0075] In this embodiment, the automatic transmission to be tested is installed on the test bench in a simulated real vehicle state, and the transmission is respectively engaged in odd / even gears, so that the rotational speed of the odd / even clutches can be controlled through the loading device. This step can further include the following steps:

[0076] Step S2021, installing the automatic transmission to be tested on the test bench in the environmental box.

[0077] Figure 3 is a schematic diagram of the structure of a device for a running-in test according to an embodiment of the present application, as shown in the figure, the device structure includes: a first load dynamometer 301, a first drive shaft 302, an automatic transmission 303, a second drive shaft 304, a second load dynamometer 305, an environmental box 306, a third drive shaft 307, and a drive dynamometer 308. Figure 3

[0078] Optionally, the automatic transmission to be tested can be installed on the test bench in the environmental box.

[0079] Step S2022, connecting the other components.

[0080] In this embodiment, the connection mode of the other components can be that the automatic transmission is connected to the first load dynamometer through the first drive shaft, the automatic transmission is connected to the second load dynamometer through the second drive shaft, and the automatic transmission is connected to the drive dynamometer through the third drive shaft.

[0081] Step S2023, connecting the bench test harness to the automatic transmission.

[0082] In this embodiment, the bench test harness is connected to the automatic transmission, the bench test harness is connected to the development version of the transmission control unit (TCU), the development version of the TCU is connected to the industrial computer through a controller area network (CAN) bus analyzer, and the gear position of the automatic transmission is set to the odd / even gear of the intermediate gear position (i.e., the 4 / 5 gear or the 5 / 6 gear of a 7-speed transmission) through the calibration software.

[0083] ​Step S203, a break-in test of the automatic transmission friction factor test is performed.

[0084] In this embodiment, a break-in test of the automatic transmission friction factor test can be performed. This step can further include the following steps:

[0085] Step S2031, the speed difference between the driving end and the driven end of the clutch is adjusted, and the torque transmitted by the clutch is recorded.

[0086] In this embodiment, the environment box temperature is set to room temperature, the test bench is adjusted so that the speed difference between the driving end and the driven end of the clutch is S1, the clutch pressure is P1, and the torque transmitted by the clutch is recorded as T1. Preferably, S1 is not greater than the maximum speed difference S max in the actual use condition of the transmission, P1 is not greater than 2 / 3P max , and P max is the clutch pressure value when the transmission reaches the maximum design torque.

[0087] Step S2032, the sliding friction work done by the clutch is calculated, and the torque of the clutch at the N1th cycle is recorded.

[0088] In this embodiment, the speed difference of the clutch is adjusted to S1, the clutch pressure is adjusted, and after N1 pressurization cycles are completed, the sliding friction work done by the clutch in the above N1 pressurization cycles is calculated as W, the torque transmitted by the clutch at the N1th cycle is recorded as T2, and k1=(T2-T1) / W, where k1 is the torque attenuation per unit sliding friction work, Figure 4 is a schematic diagram of the clutch pressure in the break-in stage according to an embodiment of the present application, as Figure 4 shown, the pressure of the clutch can be adjusted according to the clutch pressure (MPa), for example, the pressure of the clutch is adjusted to P1 in the t1 time period.

[0089] Step S2033, the sliding friction work done by the clutch is calculated, and the torque of the clutch at the N2th cycle is recorded.

[0090] In this embodiment, the speed difference of the clutch is adjusted to S1, the clutch pressure is adjusted to perform clutch pressurization cycles, when the sliding friction work generated is W, the pressurization is stopped and the cycle number N2 of the clutch pressurization is recorded, the torque transmitted by the clutch at the N2th cycle is recorded as T3, and k2=(T3-T2) / W, where the clutch pressure can be adjusted according to Figure 4 .

[0091] Step S2034, the sliding friction work done by the clutch is calculated, and the torque of the clutch at the N3th cycle is recorded.

[0092] In this embodiment, the clutch speed difference is adjusted to S1, the clutch pressure is adjusted to carry out the clutch pressurization cycle, when the generated friction work is W, the pressurization is stopped and the cycle number N3 of the clutch pressurization at this time is recorded, the torque T4 transmitted by the clutch at the N3th cycle is recorded, and k3=(T4-T3) / W, wherein, k3 can be calculated according to the following formula: Figure 4 The clutch pressure is adjusted.

[0093] In step S2035, steps S2031 to S2034 are repeated until the obtained k value is less than or equal to the threshold value k min At this time, the running-in is completed.

[0094] In step S204, the clutch spring pressure test is carried out.

[0095] In step S2041, the clutch speed difference S' is controlled, and the drag torque value after stable operation is recorded.

[0096] In step S2042, the clutch pressure and the torque are recorded.

[0097] In this embodiment, the clutch target pressure is selected in an incremental manner starting from 0 MPa, and the odd / even clutch pressure is pressurized to each target pressure in a step manner until the torque value at the input end of the transmission is greater than the drag torque value by 10 Nm, and the clutch pressure at this time is recorded, that is, the clutch spring pressure P0 under this working condition, and the torque transmitted at this time is recorded as T0.

[0098] In step S2043, steps S2041 to S2042 are repeated.

[0099] In this embodiment, steps S2041 to S2042 can be repeated until the spring pressure test of all working condition points is completed. Preferably, S' is selected from 6 speed differences between 0 and S max .

[0100] In step S205, the clutch friction coefficient test is carried out.

[0101] In step S2051, the torque value is recorded.

[0102] In this embodiment, the clutch speed difference S is controlled, the clutch pressure is set to P, and the clutch pressure is maintained for t s seconds, and then the clutch pressure is set to zero. The torque value T P after stable operation is recorded.

[0103] In step S2052, the clutch friction coefficient is calculated.

[0104] In this embodiment, the clutch friction coefficient is calculated according to the following formula:

[0105]

[0106] wherein, μ represents the friction coefficient, P represents the clutch pressure measurement value, P0 represents the clutch spring pressure, T P represents the transmission input shaft torque measurement value when the clutch pressure is P, T0 represents the transmission input shaft torque measurement value under the clutch spring pressure, S represents the clutch piston cross-sectional area, R represents the clutch friction plate equivalent radius, and n represents the number of clutch friction plates.

[0107] Step S2053, repeating step S2051 to step S2052.

[0108] In this embodiment, steps S2051 to S2052 can be repeated until the friction coefficient test of all working points is completed. Preferably, S is selected from 0 to S max , P is selected from 0 to P max .

[0109] In steps S201 to S205, the state of the automatic transmission to be tested is checked. The sample to be tested should be a sample that has passed the offline detection and the control valve block needs to complete the basic bench calibration. The automatic transmission to be tested is installed on the test bench to simulate the real vehicle state. The transmission is respectively engaged in odd / even gears, so that the odd / even clutch speed can be controlled by the loading device. The friction factor test of the automatic transmission is performed. The clutch spring pressure test is performed. The clutch friction coefficient test is performed, thereby solving the technical problem that the clutch friction coefficient cannot be tested, and achieving the technical effect that the clutch friction coefficient can be tested.

[0110] Embodiment 3

[0111] According to the embodiment of the present application, a test device for a clutch is provided. It should be noted that the test device for a clutch can be used to execute the test method for a clutch in embodiment 1.

[0112] Figure 5 is a schematic diagram of a test device for a clutch according to an embodiment of the present application. As Figure 5 shown, a test device for a clutch 500 can include a first acquisition unit 501, a running-in test unit 502, a second acquisition unit 503, and a determination unit 504.

[0113] The first acquisition unit 501 is configured to acquire a test instruction for testing a to-be-tested clutch.

[0114] The running-in test unit 502 is configured to control the clutch test device to perform a running-in test on the to-be-tested clutch in response to a test instruction, and obtain an initial test result, wherein the initial test result is used to represent a working state of the to-be-tested clutch, and the working state is switched from an original working state to a stable working state.

[0115] The second acquisition unit 503 is configured to acquire a spring pressure and a torque of the to-be-tested clutch under at least one to-be-tested working condition in the stable working state.

[0116] The determination unit 504 is configured to determine a target test result of the to-be-tested clutch based on the spring pressure and the torque, wherein the target test result at least includes a performance index parameter of the to-be-tested clutch.

[0117] Optionally, the running-in test unit 502 includes an adjustment module configured to adjust a speed difference between a driving end and a driven end of the to-be-tested clutch from an original speed difference to a reference speed difference, and adjust the spring pressure from an original pressure to a reference pressure; a first acquisition module configured to control the clutch test device to perform a plurality of pressurization cycles on the to-be-tested clutch based on the reference speed difference and the reference pressure, and obtain a plurality of sliding friction work done by the to-be-tested clutch in the pressurization cycles and a plurality of target torques of the to-be-tested clutch in the pressurization cycles; and a second acquisition module configured to obtain the initial test result based on the plurality of sliding friction work and the plurality of target torques.

[0118] Optionally, the second acquisition module can include a first determination sub-module configured to determine a torque change amount of the to-be-tested clutch under a unit sliding friction work based on a target sliding friction work in the plurality of sliding friction work and a first target torque and a second target torque in the plurality of target torques, wherein a first time at which the to-be-tested clutch transmits the first target torque is earlier than a second time at which the to-be-tested clutch generates the second target torque, and the target sliding friction work is work done by the to-be-tested clutch at the second time; and an acquisition sub-module configured to obtain the initial test result in response to the torque change amount being less than or equal to a change amount threshold.

[0119] Optionally, the second acquisition unit 503 can include a first determination module configured to determine a plurality of to-be-tested pressures for performing a spring pressure test on the to-be-tested clutch in the stable working state, wherein the plurality of to-be-tested pressures are sorted in an increasing manner; a third acquisition module configured to apply the plurality of to-be-tested pressures to the to-be-tested clutch in the at least one to-be-tested working condition in the increasing manner, and obtain a plurality of test torques transmitted by the to-be-tested clutch under the plurality of to-be-tested pressures, wherein the plurality of to-be-tested pressures are associated with the plurality of test torques; and a second determination module configured to determine the spring pressure and the torque based on the plurality of test torques.

[0120] Optionally, the second determining module can comprise: a second determining submodule, configured to determine the test pressure corresponding to the test torque in the plurality of test pressures as the spring pressure, in response to a difference or a ratio between the at least one test torque in the plurality of test torques and the test torque threshold being greater than or equal to a target threshold; and a third determining submodule, configured to determine the torque based on the spring pressure.

[0121] Optionally, the third determining submodule can comprise: applying the spring pressure to the test clutch in a target time period; and updating the spring pressure to a target spring pressure in a time period after the target time period, to obtain the torque of the test clutch in the stable working state, wherein the target spring pressure is less than the spring pressure.

[0122] In this embodiment, the first obtaining unit obtains a test instruction for testing the test clutch; the running-in test unit controls the clutch test device to perform a running-in test on the test clutch to obtain an initial test result, in response to the test instruction, wherein the initial test result is used to represent a working state of the test clutch, which is switched from an original working state to a stable working state; the second obtaining unit obtains the spring pressure and the torque of the test clutch in at least one test working condition in the stable working state; and the determining unit determines a target test result of the test clutch based on the spring pressure and the torque, wherein the target test result at least comprises a performance index parameter of the test clutch, thereby solving the technical problem that the clutch friction coefficient cannot be tested, and achieving the technical effect that the clutch friction coefficient can be tested.

[0123] Embodiment 4

[0124] According to the embodiments of the present application, a computer readable storage medium is further provided, which comprises a stored program, wherein the program controls the device where the computer readable storage medium is located to execute the test method of the clutch in the embodiment 1 when the program is running.

[0125] Embodiment 5

[0126] According to the embodiments of the present application, a processor is further provided, which is used to run a program, wherein the program executes the test method of the clutch in the embodiment 1 when the program is running.

[0127] Embodiment 6

[0128] According to the embodiments of the present application, a vehicle is further provided, which is used to execute the test method of the clutch in the embodiment 1.

[0129] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0130] In the above-mentioned embodiments of the present application, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0131] In several embodiments provided by the present application, it should be understood that the disclosed technology can be implemented in other manners. For example, the described embodiments of the device are merely schematic, and the unit division is merely logical function division, and there can be other division manners in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, and electrical or mechanical couplings or communication connections.

[0132] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on a plurality of units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0133] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0134] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the present application essentially or substantially or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0135] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the present application.

Claims

1. A method of testing a clutch, characterized by, The method comprises: obtaining a test instruction for testing a to-be-tested clutch; in response to the test instruction, controlling a clutch test device to perform a running-in test on the to-be-tested clutch to obtain an initial test result, wherein the initial test result is used to represent a working state of the to-be-tested clutch, and the working state is switched from an original working state to a stable working state; under the stable working state, obtaining a spring pressure and a torque of the to-be-tested clutch under at least one to-be-tested working condition; based on the spring pressure and the torque, determining a target test result of the to-be-tested clutch, wherein the target test result at least comprises a performance index parameter of the to-be-tested clutch; wherein, controlling the clutch test device to perform the running-in test on the to-be-tested clutch to obtain the initial test result comprises: adjusting a speed difference between a driving end and a driven end of the to-be-tested clutch from an original speed difference to a reference speed difference, and adjusting the spring pressure from an original pressure to a reference pressure; controlling the clutch test device to perform a plurality of pressurization cycles on the to-be-tested clutch based on the reference speed difference and the reference pressure, to obtain a plurality of sliding friction work done by the to-be-tested clutch in the process of the pressurization cycles, and a plurality of target torques of the to-be-tested clutch at the time of the pressurization cycles; and obtaining the initial test result based on the plurality of sliding friction work and the plurality of target torques.

2. The method of claim 1, wherein, Based on the plurality of sliding friction work and the plurality of target torques, the initial test result is obtained, comprising: based on a target sliding friction work in the plurality of sliding friction work, and a first target torque and a second target torque in the plurality of target torques, determining a torque change amount of the to-be-tested clutch under a unit sliding friction work, wherein a first time at which the to-be-tested clutch transmits the first target torque is earlier than a second time at which the to-be-tested clutch generates the second target torque, and the target sliding friction work is the work done by the to-be-tested clutch at the second time; in response to the torque change amount being less than or equal to a change amount threshold, the initial test result is obtained.

3. The method of claim 1, wherein, Under the stable working state, the spring pressure and the torque of the to-be-tested clutch under at least one to-be-tested working condition are obtained, comprising: under the stable working state, a plurality of to-be-tested pressures for testing the spring pressure of the to-be-tested clutch are determined, wherein the plurality of to-be-tested pressures are sorted in an increasing manner; under the at least one to-be-tested working condition, the plurality of to-be-tested pressures are applied to the to-be-tested clutch in the increasing manner, to obtain a plurality of test torques transmitted by the to-be-tested clutch under the plurality of to-be-tested pressures, wherein the plurality of to-be-tested pressures are associated with the plurality of test torques; based on the plurality of test torques, the spring pressure and the torque are determined.

4. The method of claim 3, wherein, Based on the plurality of test torques, the spring pressure and the torque are determined, comprising: in response to a difference or a ratio between at least one test torque in the plurality of test torques and a test torque threshold being greater than or equal to a target threshold, a to-be-tested pressure corresponding to the test torque in the plurality of to-be-tested pressures is determined as the spring pressure; based on the spring pressure, the torque is determined.

5. The method of claim 4, wherein, Based on the spring pressure, the torque is determined, comprising: applying the spring pressure to the to-be-tested clutch in a target time period; updating the spring pressure to a target spring pressure in a time period after the target time period, and obtaining the torque of the to-be-tested clutch in the stable working state, wherein the target spring pressure is less than the spring pressure.

6. A testing device for a clutch, characterized in that comprising: a first obtaining unit configured to obtain a test instruction for testing a to-be-tested clutch; a running-in test unit configured to control a clutch test device to perform a running-in test on the to-be-tested clutch according to the test instruction, and obtain an initial test result, wherein the initial test result is used to represent a working state of the to-be-tested clutch, and the working state is switched from an original working state to a stable working state; a second obtaining unit configured to obtain a spring pressure and a torque of the to-be-tested clutch in at least one to-be-tested working condition in the stable working state; a determining unit configured to determine a target test result of the to-be-tested clutch based on the spring pressure and the torque, wherein the target test result comprises at least a performance index parameter of the to-be-tested clutch; the running-in test unit is further configured to adjust a rotational speed difference between a driving end and a driven end of the to-be-tested clutch from an original rotational speed difference to a reference rotational speed difference, and adjust the spring pressure from an original pressure to a reference pressure; control the clutch test device to perform a plurality of pressurization cycles on the to-be-tested clutch based on the reference rotational speed difference and the reference pressure, obtain a plurality of sliding friction works performed by the to-be-tested clutch in the pressurization cycles, and obtain a plurality of target torques of the to-be-tested clutch in the pressurization cycles; and obtain the initial test result based on the plurality of sliding friction works and the plurality of target torques.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to perform the test method of the clutch in any one of claims 1 to 5 when the program is running.

8. A processor, comprising: The processor is used to run a program, wherein the program is executed by the processor to perform the test method of the clutch in any one of claims 1 to 5 when the program is running.

9. A vehicle characterized by comprising: The test method of the clutch in any one of claims 1 to 5 is used to perform.

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