Automatic dog clutch characteristic testing method and related device

Abstract

The embodiment of the invention discloses a dog clutch characteristic automatic test method and a related device. The method comprises the following steps: acquiring an input rotating speed and an output rotating speed of a dog clutch; calculating the two-end speed difference of the dog clutch according to the input rotating speed and the output rotating speed; adjusting the input speed according to a preset input speed, and adjusting the output speed according to a preset output speed; in response to determining that the input rotating speed is equal to the preset input rotating speed and the output rotating speed is equal to the preset output rotating speed, controlling the dog-tooth clutch to be combined; in response to determining that the dog clutch is engaged, a differential at both ends when the dog clutch is engaged is determined. The input rotating speed and the output rotating speed of the dog clutch are automatically corrected through the controller so as to test the speed difference between the two ends when the dog clutch is combined, then the characteristics of the dog clutch can be obtained according to the speed difference between the two ends when the dog clutch can be combined, and automatic testing of the characteristics of the dog clutch is achieved.

Description

Technical Field

[0001] The present application relates to the field of testing technology, and in particular to an automatic testing method and related device for dog clutch characteristics. Background Art

[0002] The dog clutch is a common mechanical transmission device. Its working principle is to achieve the transmission and disconnection of power between input and output through the engagement and separation of the dog teeth on the clutch. It is widely used in various automatic transmissions. Since the characteristics of the dog clutch are related to the structural design of the automatic transmission, it is necessary to test the characteristics of the dog clutch.

[0003] Related technology testing of dog tooth characteristics usually adopts manual control, that is, through the test bench, manually adjusting the input speed and output speed at both ends of the dog tooth clutch, or adjusting the engagement side pressure and disengagement side pressure of the dog tooth clutch, so as to change the speed difference at both ends when the dog tooth clutch is engaged, or change the torque when the dog tooth clutch is disengaged, thereby completing the test of the dog tooth clutch characteristics.

[0004] However, since the test of the dog clutch requires multiple adjustments to the input speed, output speed, engagement side pressure and disengagement side pressure in order to obtain the characteristics of the dog clutch through multiple tests, the manual operation method has low testing efficiency and it is difficult to achieve efficient testing of the dog clutch characteristics. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides an automatic testing method and related devices for the dog tooth characteristics of a dog tooth clutch, which realizes automatic testing by correcting various parameters of the dog tooth clutch in real time through a controller, thereby improving the testing efficiency of the dog tooth clutch characteristics.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present application discloses a method for automatically testing characteristics of a dog clutch, the method comprising:

[0008] Obtaining the input speed and output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch;

[0009] The input speed is adjusted according to a preset input speed, and the output speed is adjusted according to a preset output speed; the preset input speed and the preset output speed are preset according to a test condition of the dog clutch;

[0010] In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, controlling the dog clutch to engage;

[0011] In response to determining that the dog clutch is engaged, the speed difference between both ends of the dog clutch when engaged is determined; the speed difference between both ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

[0012] Optionally, the method further includes:

[0013] In response to determining that the engagement of the dog clutch fails or the speed difference between the two ends is greater than a preset speed difference threshold, the dog clutch is controlled to be disengaged.

[0014] Optionally, in response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, controlling the dog clutch to engage includes:

[0015] In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, providing an engagement torque to the dog clutch by increasing an engagement-side cylinder pressure of the dog clutch and / or decreasing a disengagement-side cylinder pressure of the dog clutch;

[0016] The dog clutch is controlled to engage according to the engagement torque.

[0017] In a second aspect, an embodiment of the present application discloses a method for automatically testing characteristics of a dog clutch, the method comprising:

[0018] Acquire the current position of the dog clutch and the input speed of the dog clutch; the input speed is the input end speed of the dog clutch;

[0019] In response to the current position of the dog clutch being the dog clutch engaged and the input speed of the dog clutch being greater than or equal to an idle speed, adjusting the input torque of the dog clutch according to a preset input torque;

[0020] In response to determining that the input torque of the dog clutch is equal to the preset input torque, controlling the dog clutch to be disengaged;

[0021] In response to determining that the dog clutch is disengaged, an input torque when the dog clutch is disengaged is determined.

[0022] Optionally, in response to determining that the dog clutch is disengaged, after determining the input torque when the dog clutch is disengaged, the method further includes:

[0023] In response to determining the input torque when the dog clutch is disengaged, the input speed is controlled to zero.

[0024] Optionally, the method further includes:

[0025] In response to the dog tooth position change of the dog tooth clutch being greater than a change threshold, or the disengagement side oil cylinder pressure of the dog tooth clutch reaching a maximum value, providing engagement torque for the dog tooth clutch by increasing the engagement side oil cylinder pressure of the dog tooth clutch and / or decreasing the disengagement side oil cylinder pressure of the dog tooth clutch;

[0026] The dog clutch is controlled to engage according to the engagement torque.

[0027] In a third aspect, an embodiment of the present application discloses a device for automatically testing characteristics of a dog clutch, the device comprising:

[0028] A first acquisition unit is used to acquire an input speed and an output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch;

[0029] a first speed adjustment unit, configured to adjust the input speed according to a preset input speed, and to adjust the output speed according to a preset output speed; the preset input speed and the preset output speed are preset according to a test condition of the dog clutch;

[0030] a first clutch control unit, configured to control the dog clutch to engage in response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed;

[0031] The speed difference determination unit is used to determine the speed difference between the two ends of the dog clutch when it is engaged in response to determining that the dog clutch is engaged; the speed difference between the two ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

[0032] Optionally, the device further comprises:

[0033] The third clutch control unit is used to control the dog clutch to disengage in response to determining that the dog clutch fails to engage or the speed difference between the two ends is greater than a preset speed difference threshold.

[0034] Optionally, the first clutch control unit is further used for:

[0035] In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, providing an engagement torque to the dog clutch by increasing an engagement-side cylinder pressure of the dog clutch and / or decreasing a disengagement-side cylinder pressure of the dog clutch;

[0036] The dog clutch is controlled to engage according to the engagement torque.

[0037] In a fourth aspect, an embodiment of the present application discloses a dog clutch characteristic automatic testing device, the device comprising:

[0038] A second acquisition unit is used to acquire the current position of the dog clutch and the input speed of the dog clutch; the input speed is the input end speed of the dog clutch;

[0039] a first torque adjustment unit, configured to adjust the input torque of the dog clutch according to a preset input torque in response to the current position of the dog clutch being the dog clutch being engaged and the input speed of the dog clutch being greater than or equal to an idle speed;

[0040] a second clutch control unit, configured to control the dog clutch to be disengaged in response to determining that the input torque of the dog clutch is equal to a preset input torque;

[0041] The torque determination unit is configured to determine an input torque when the dog clutch is disengaged in response to determining that the dog clutch is disengaged.

[0042] Optionally, the device further comprises:

[0043] The second torque adjustment unit is used for controlling the input speed to zero in response to determining the input torque when the dog clutch is disengaged.

[0044] Optionally, the device further comprises:

[0045] a torque providing unit, configured to provide an engagement torque for the dog clutch by increasing the engagement side cylinder pressure of the dog clutch and / or decreasing the separation side cylinder pressure of the dog clutch in response to a dog position change of the dog clutch being greater than a change threshold or a separation side oil cylinder pressure of the dog clutch reaching a maximum value;

[0046] The fourth clutch control unit is used to control the engagement of the dog clutch according to the engagement torque.

[0047] In a fifth aspect, an embodiment of the present application discloses a computer device, wherein the computer device includes a processor and a memory:

[0048] The memory is used to store program code and transmit the program code to the processor;

[0049] The processor is used to execute the automatic testing method for dog clutch characteristics as described in the first aspect, the second aspect, and any optional item of the first aspect or the second aspect according to the instructions in the program code.

[0050] In a sixth aspect, an embodiment of the present application discloses a computer-readable storage medium, which is used to store a computer program. When the computer program is executed by a processor, it is used to execute the automatic testing method of the dog clutch characteristics as described in the first aspect, the second aspect, and any optional option of the first aspect or the second aspect.

[0051] It can be seen from the above technical scheme that by obtaining the input speed and output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch; according to the input speed and the output speed, the speed difference between the two ends of the dog clutch is calculated; the input speed is adjusted according to the preset input speed, and the output speed is adjusted according to the preset output speed; in response to determining that the input speed is equal to the preset input speed, and the output speed is equal to the preset output speed, the dog clutch is controlled to engage; in response to determining that the dog clutch is engaged, the speed difference between the two ends when the dog clutch is engaged is determined. The input speed and output speed of the dog clutch are automatically corrected by the controller to test the speed difference between the two ends when the dog clutch is engaged, and then the characteristics of the dog clutch are obtained according to the speed difference between the two ends when the dog clutch can be engaged, so as to realize the automated testing of the characteristics of the dog clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A flow chart of a method for automatically testing characteristics of a dog clutch provided in an embodiment of the present application;

[0054] Figure 2 A flow chart of another method for automatically testing characteristics of a dog clutch provided in an embodiment of the present application;

[0055] Figure 3 A device structure and interactive schematic diagram for automatic testing of dog clutch characteristics provided in an embodiment of the present application;

[0056] Figure 4 A schematic diagram of an automatic transmission structure for automatic testing of dog clutch characteristics provided in an embodiment of the present application;

[0057] Figure 5 A logic diagram of the automatic test steps of dog clutch characteristics provided in an embodiment of the present application;

[0058] Figure 6A logic diagram of another automatic test step of dog clutch characteristics provided in an embodiment of the present application;

[0059] Figure 7 A structural block diagram of a device for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application;

[0060] Figure 8 A structural block diagram of another device for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application;

[0061] Fig. 9 A structural block diagram of a computer device for automatic testing of dog clutch characteristics provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0063] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is just a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0064] In order to facilitate understanding of the technical solution of the present application, the technical terms involved in the present application are introduced below.

[0065] The dog clutch is a power transmission device that transmits speed and torque from the input end to the output end through the engagement and disengagement of the dog clutch. It is widely used in automatic transmissions to transmit the power provided by the engine to the output end. Since different dog clutches have different characteristics, and the characteristics of the dog clutch are related to the hardware structure of the automatic transmission where the dog clutch is located, it is necessary to test the characteristics of the dog clutch.

[0066] The characteristics of the dog clutch include speed difference characteristics. When the dog clutch is engaged, it is necessary to provide a suitable speed difference between the input and output ends of the dog clutch, so that the dog clutch will not get stuck due to too small a speed difference when engaged, nor will it jitter due to too large a speed difference when engaged.

[0067] The related technology tests the speed differential characteristics of the dog clutch by manual testing. That is, by manually inputting relevant parameters, providing input speed and output speed for the input and output ends of the dog clutch, calculating the speed difference by the input speed and output speed, and then controlling the dog clutch to combine at the input speed and the output speed, and obtaining the speed differential characteristics of the dog clutch according to the combination of the dog clutch. However, the manual testing method requires multiple manual adjustments of the input speed and output speed of the dog clutch, and then testing the speed differential characteristics of the dog clutch. The testing efficiency is low, and it is impossible to achieve efficient testing of the speed differential characteristics of the dog clutch.

[0068] In order to solve the above technical problems, the present application provides a method for automatically testing the characteristics of a dog clutch. The controller adjusts the input speed and output speed of the dog clutch according to the operating point to be tested. When the input speed and output speed are respectively adjusted to the preset input speed and preset output speed required by the test operating point, the dog clutch is controlled to engage. If the dog clutch is successfully engaged, the speed difference between the two ends when the dog clutch is engaged is determined, thereby obtaining the speed difference that the dog clutch can engage with, so as to realize the test of the speed difference characteristics of the dog clutch. The controller automatically controls the input speed and output speed during the dog clutch characteristic test according to the preset operating point to realize the automatic test of the dog clutch, without the need for manual adjustment of the input speed and output speed during manual testing, thereby improving the test efficiency of the dog clutch characteristics.

[0069] The following is an introduction to the dog clutch characteristic automatic testing method provided by the embodiment of the present application in conjunction with the accompanying drawings. The testing process can be a separate characteristic test for the dog clutch component, or it can be a test for the characteristics of the dog clutch installed in the automatic transmission by testing the automatic transmission.

[0070] See also Figure 1 , Figure 1 A flow chart of a method for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application. The method comprises:

[0071] S101: Obtaining the input speed and output speed of the dog clutch.

[0072] The input speed of the dog clutch is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch.

[0073] In some possible implementations, when performing a characteristic test on a single dog clutch assembly, the characteristic test of the dog clutch can be performed by providing motor drive for the left and right ends of the dog clutch, that is, an input motor is connected to the input end of the dog clutch, and an output motor is connected to the output end of the dog clutch, and the input motor and the output motor are driven by current. The rotation of the two motors drives the input end and the output end of the dog clutch to rotate, so that the dog clutch has an input speed and an output speed.

[0074] In some other possible implementations, when testing the characteristics of a dog clutch installed in an automatic transmission, an input motor and an output motor may be connected to both ends of the automatic transmission, and the input speed and output speed of the dog clutch at corresponding speeds may be calculated based on the transmission conditions inside the automatic transmission.

[0075] The input speed and output speed of the dog clutch can be obtained through the automatic transmission control unit (TCU).

[0076] In some possible implementations of the embodiments of the present application, for testing the characteristics of the dog clutch in an automatic transmission, the speed of the input motor and the speed of the output motor can be obtained through the TCU, and the input speed and output speed of the dog clutch can be calculated based on the transmission conditions inside the automatic transmission, such as the engagement and disengagement of different multi-plate clutches, and the rotation conditions of the driving and driven gears.

[0077] S102: adjusting the input speed according to a preset input speed, and adjusting the output speed according to a preset output speed.

[0078] Among them, the preset input speed and the preset output speed are preset according to the test conditions of the dog clutch, that is, it is necessary to test the engagement condition of the dog clutch at the input speed and the output speed to determine the speed difference characteristics of the dog clutch.

[0079] For the adjustment process of input speed and output speed, the test condition table can be pre-set in the host computer software of the test bench. The TCU and the test bench are connected through a communication protocol to read the test condition table stored in the host computer software of the test bench. According to the preset input speed and preset output speed in the test condition table, the speed of the input motor and the output motor is automatically adjusted through the test bench.

[0080] During the test, the preset input speed corresponds to the preset output speed one by one, that is, during the test, one preset input speed corresponds to one preset output speed. The preset input speed and the preset output speed can be stored in the test condition table in the form of separate lines.

[0081] The preset input speed can be one or more, and the preset output speed is the same. The same preset input speed can correspond to multiple different preset output speeds, so that when the input speed provided by the input motor to the dog clutch is constant, different output speeds can be provided to the dog clutch by adjusting the speed of the output motor, so that the dog clutch has different speed differences, thereby controlling the dog clutch to engage at different speed differences.

[0082] S103: In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, controlling the dog clutch to engage.

[0083] Since the dog clutch is in a separated state before starting the speed differential characteristic test of the dog clutch, when the input end speed of the dog clutch is equal to the preset input speed, and the output end speed of the dog clutch is equal to the preset output speed, that is, when both ends of the dog clutch have reached the test conditions, the dog clutch can be controlled to engage to obtain the speed differential characteristics when the dog clutch is engaged.

[0084] In some possible implementations of the embodiments of the present application, the dog gear transmission can be controlled by controlling the oil cylinder pressure on the engagement side and the oil cylinder pressure on the disengagement side. The specific control method is that in response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, the dog gear clutch is controlled to engage, including:

[0085] In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, providing an engagement torque to the dog clutch by increasing an engagement-side cylinder pressure of the dog clutch and / or decreasing a disengagement-side cylinder pressure of the dog clutch;

[0086] The dog clutch is controlled to engage according to the engagement torque.

[0087] In some possible implementations, when testing the characteristics of the dog clutch in an automatic transmission, when both ends of the dog clutch have reached the test conditions and the test can begin, the TCU changes the dog clutch engagement side cylinder pressure and the disengagement side cylinder pressure based on the current pressures of the dog clutch engagement side cylinder and the dog clutch disengagement side cylinder to control the engagement of the dog clutch.

[0088] For example: when the pressure of the oil cylinder on the engagement side of the dog clutch is relatively low, the pressure of the oil cylinder on the engagement side can be increased by injecting hydraulic oil into the oil cylinder on the engagement side; when the pressure of the oil cylinder on the disengagement side of the dog clutch is relatively high, the pressure of the oil cylinder on the disengagement side can be reduced by exporting hydraulic oil from the oil cylinder on the disengagement side; of course, the pressure of the oil cylinder on the engagement side can be increased and the pressure of the oil cylinder on the disengagement side can be reduced at the same time to speed up the speed of providing the engagement torque to the dog clutch and reduce the time consumed in the engagement process of the dog clutch.

[0089] S104: In response to determining that the dog clutch is engaged, determining the speed difference between both ends when the dog clutch is engaged.

[0090] The speed difference between the two ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

[0091] By obtaining the speed difference between the two ends of the dog clutch when it is successfully engaged, it can be known that the dog clutch can be engaged under this speed difference between the two ends, and the engagement characteristics of the dog clutch under this speed difference are also known.

[0092] In some possible implementations of the embodiments of the present application, by storing multiple pairs of preset input speeds and preset output speeds in a test condition table, the TCU traverses the multiple pairs of preset input speeds and preset output speeds in the test condition table during testing, and then records the engagement status of the dog clutch for each pair of preset input speeds and preset output speeds, thereby obtaining the engagement characteristics of the dog clutch under multiple speed differences, that is, the speed difference characteristics of the dog clutch.

[0093] Since the dog clutch characteristic test will inevitably conduct a combination test on an inappropriate speed difference, if the speed difference at both ends of the dog clutch is too large, the dog teeth at the high speed end will hit the dog teeth at the low speed end when the dog clutch is combined, that is, the combination tooth-beating phenomenon, which will cause hardware damage to the dog clutch, which is not conducive to the continuous test of the speed difference characteristics of the dog clutch; and if the speed difference at both ends of the dog clutch is too small, if the dog clutch is not successfully combined when combined, due to the small speed difference at both ends of the dog clutch, the input and output ends of the dog clutch are always tooth tip to tooth tip and tooth gap to tooth gap, which will cause the dog clutch to have a dog tooth stuck phenomenon, which will also cause hardware damage to the dog clutch under the action of the combined torque. The manual control method is even more difficult to adjust in time when the dog clutch has a combination tooth-beating or dog tooth stuck phenomenon.

[0094] In order to reduce the hardware damage of the dog clutch during the characteristic test, based on the above embodiment, the method further includes:

[0095] In response to determining that the dog clutch fails to engage or the speed difference between the two ends is greater than a preset speed difference threshold, the dog clutch is controlled to be disengaged.

[0096] The dog clutch engagement failure may be a state in which the dog clutch cannot be engaged due to dog gear jamming. The preset speed difference threshold may be preset based on the speed difference characteristic test results of other dog clutches.

[0097] In some possible implementations of the present embodiment, during the entire process of controlling the engagement of the dog clutch, the input speed, output speed and speed difference at both ends of the dog clutch are monitored in real time. When the input speed or output speed of the dog clutch drops suddenly, it indicates that the dog clutch has a dog tooth jam phenomenon. When the speed difference between the two ends of the dog clutch is too large and the speed of one end of the dog clutch fluctuates violently, it indicates that the dog clutch has an engagement and tooth jam phenomenon. At this time, the dog clutch is separated by controlling the TCU.

[0098] Since the dog clutch is in the state of being engaged or being engaged when controlling the dog clutch to be disengaged, the process of controlling the clutch to be disengaged can be controlled by referring to the above-mentioned process of controlling the clutch to be engaged. For example, when the pressure of the oil cylinder on the engagement side of the dog clutch is relatively high, the pressure of the oil cylinder on the engagement side can be reduced by extracting hydraulic oil from the oil cylinder on the engagement side; when the pressure of the oil cylinder on the disengagement side of the dog clutch is relatively low, the pressure of the oil cylinder on the disengagement side can be increased by injecting hydraulic oil into the oil cylinder on the disengagement side; of course, the pressure of the oil cylinder on the engagement side can be reduced and the pressure of the oil cylinder on the disengagement side can be increased at the same time to speed up the disengagement speed of the dog clutch and further reduce the probability of hardware damage to the dog clutch.

[0099] Through the above control method, when the dog clutch cannot be engaged or the speed difference between the two ends of the dog clutch is too large, the two ends of the dog clutch are promptly controlled to separate to reduce hardware damage to the dog clutch.

[0100] Of course, the characteristics of the dog clutch also include the disengagement force characteristics. When the dog teeth are disengaged, it is necessary to provide the dog clutch with a suitable input torque to achieve the dog teeth disengagement. This input torque is called the disengagement force. If the disengagement force is too small, the dog clutch cannot be disengaged. If the disengagement force is too large, the impact when the dog clutch is disengaged will be too large, affecting the driving comfort. Therefore, it is also necessary to test the disengagement force characteristics of the dog clutch.

[0101] Similar to the problems existing in the speed difference test, the relevant technology requires manual testing to adjust the test bench to the torque control mode, that is, the input torque of the dog clutch can be controlled by operating the test bench. The manual adjustment of the input torque of the dog clutch requires multiple manual adjustments of the input torque of the dog clutch, which is inefficient when testing the disengagement force characteristics of the dog clutch.

[0102] In order to solve the above technical problems, the present application also provides a method for automatically testing the characteristics of a dog clutch.

[0103] See also Figure 2 , Figure 2 Another method for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application is a flow chart. The method comprises:

[0104] S201: Acquire the current position of the dog clutch and the input speed of the dog clutch.

[0105] The input speed is the input end speed of the dog clutch, and the input end speed can be provided by an input motor connected to the input end of the dog clutch.

[0106] S202: In response to the current position of the dog clutch being engaged and the input speed of the dog clutch being greater than or equal to the idle speed, adjusting the input torque of the dog clutch according to a preset input torque.

[0107] When it is determined that the dog clutch is in the engaged position, the input torque of the dog clutch may be adjusted to start the disengagement force characteristic test.

[0108] When the input speed of the dog clutch is greater than or equal to the idle speed, the input torque of the dog clutch can be adjusted by controlling the flow of hydraulic oil in and out of the dog clutch cylinder.

[0109] Regarding the adjustment process and specific implementation of the input torque of the dog clutch, as well as the setting method of the preset input torque, refer to the above-mentioned adjustment method for the input speed and output speed and the setting method of the preset input speed. The input torque can be adjusted by controlling the test bench through the TCU, and the preset input torque saved in the torque test condition table stored in the host computer software of the test bench will not be repeated here.

[0110] S203: In response to determining that the input torque of the dog clutch is equal to the preset input torque, controlling the dog clutch to be disengaged.

[0111] Among them, in some possible implementation methods of the embodiments of the present application, the engagement and disengagement of the dog clutch can also be adjusted by adjusting the cylinder pressure on the engagement side and the cylinder pressure on the disengagement side of the dog clutch. The specific adjustment method refers to the adjustment method for the engagement and disengagement of the dog clutch mentioned above, which will not be repeated here.

[0112] S204: In response to determining that the dog clutch is disengaged, determine the input torque when the dog clutch is disengaged.

[0113] During the disengagement force characteristic test of the dog clutch, at the moment when the dog clutch is disengaged, the input torque is still driving the input end of the dog clutch, causing the speed of the input end of the dog clutch to soar and cause impact, resulting in hardware damage to the dog clutch during the characteristic test.

[0114] In order to reduce the hardware damage of the dog clutch, based on the above embodiment, the method further includes:

[0115] In response to determining the input torque when the dog clutch is disengaged, the input speed is controlled to zero.

[0116] The input speed can be set to zero by controlling the driving speed of the input motor, setting the driving speed of the input motor to zero, or driving the input motor to reverse, so as to provide a reverse torque to the input end of the dog clutch and reduce the input speed of the dog clutch.

[0117] The controller sets the input speed of the dog clutch to zero when the dog clutch is disengaged, thereby reducing the input speed of the dog clutch when it is disengaged and reducing the probability of hardware damage to the dog clutch.

[0118] In order to further reduce the hardware damage of the dog clutch, based on the above embodiment, the method further includes:

[0119] In response to the dog gear position change of the dog gear clutch being greater than the change amount threshold, or the disengagement side oil cylinder pressure of the dog gear clutch reaching a maximum value, providing engagement torque for the dog gear clutch by increasing the engagement side oil cylinder pressure of the dog gear clutch and / or decreasing the disengagement side oil cylinder pressure of the dog gear clutch;

[0120] The dog clutch is controlled to engage according to the engagement torque.

[0121] In some possible implementations, when testing the disengagement force characteristics of the dog clutch in the automatic transmission, the TCU changes the dog clutch engagement side cylinder pressure and the disengagement side cylinder pressure according to the current pressures of the dog clutch engagement side cylinder and the dog clutch disengagement side cylinder to control the dog clutch disengagement.

[0122] For example: when the pressure of the oil cylinder on the engagement side of the dog clutch is relatively high, the pressure of the oil cylinder on the engagement side can be reduced by extracting hydraulic oil from the oil cylinder on the engagement side; when the pressure of the oil cylinder on the disengagement side of the dog clutch is relatively low, the pressure of the oil cylinder on the disengagement side can be increased by injecting hydraulic oil into the oil cylinder on the disengagement side; of course, the pressure of the oil cylinder on the engagement side can be reduced and the pressure of the oil cylinder on the disengagement side can be increased at the same time to speed up the disengagement speed of the dog clutch.

[0123] Through the above control method, when the dog clutch is separated to a certain extent, the dog clutch can be controlled to re-engage to prevent the impact caused by the input motor drive at the moment of separation causing the speed of the dog clutch input end to soar.

[0124] After completing a dog clutch disengagement force test, the input torque can be set to zero, and the next test operating point can be traversed through the TCU to provide the dog clutch with the input torque corresponding to the next test operating point to perform a disengagement force test at the next test operating point.

[0125] Next, we will combine a practical scenario and Figures 3 to 8 , the dog clutch characteristic automatic testing method provided in the embodiment of the present application is introduced. In this scenario, the dog clutch is used in an automatic transmission, and at this time, the characteristic of the dog clutch in the automatic transmission is automatically tested.

[0126] See also Figure 3 , Figure 3 The present invention provides a device structure and interactive schematic diagram for automatic testing of dog clutch characteristics. The device includes:

[0127] 310: Test bench host computer software; 320: TCU; 330: Input motor; 340: Output motor; 350: Automatic transmission.

[0128] See also Figure 4 , Figure 4 The following is a schematic diagram of an automatic transmission structure for automatic testing of dog clutch characteristics provided in an embodiment of the present application. The automatic transmission is a planetary gearbox automatic transmission. Figure 3 The structure details of the automatic transmission 350 are shown in FIG. 1 , and the automatic transmission includes:

[0129] 410: engine; 420: torque converter; 430: input shaft; 440: locking clutch; 450: first planetary gear; 460: auxiliary clutch; 470: second planetary gear; 480: dog clutch; 490: output shaft; wherein the dog clutch further includes a separation side oil cylinder 481 and a coupling side oil cylinder 482.

[0130] See also Figure 5 , Figure 5 A logic diagram of an automatic test step of dog clutch characteristics provided in an embodiment of the present application, wherein the automatic test step of dog clutch characteristics is performed by Figure 3 and Figure 4 The equipment and automatic transmission structure shown are Figure 4 Steps for performing speed differential characteristic test on the dog clutch 480 in FIG.

[0131] This step includes S501-S510:

[0132] S501: Start;

[0133] S502: Determine whether the test is activated; if yes, proceed to S503; if no, reactivate the test;

[0134] S503: Torque converter opens, lock-up clutch engages;

[0135] S504: Determine whether the automatic transmission is ready; if yes, proceed to S505; if no, delay for a period of time and re-determine whether the automatic transmission is ready;

[0136] S505: Speed ​​difference test starts;

[0137] S506: Determine whether the speed difference exceeds a preset speed difference threshold; if not, proceed to S507; if yes, proceed to S508;

[0138] S507: Determine whether the test is completed; if yes, proceed to S509; if no, proceed to S505;

[0139] S508: increasing the oil cylinder pressure on the separation side;

[0140] S509: Determine whether all preset operating points have been traversed; if yes, proceed to S510; if no, proceed to S504;

[0141] S510: End.

[0142] See also Figure 6 , Figure 6 This is another logic diagram of the dog clutch characteristic automatic test step provided in the embodiment of the present application. The dog clutch characteristic automatic test step is to Figure 3 and Figure 4 The equipment and automatic transmission structure shown are Figure 4 The dog clutch 480 in the embodiment of the present invention performs a disengagement force characteristic test. The steps include S601-S611:

[0143] S601: Start;

[0144] S602: adjusting the input motor speed to idle speed;

[0145] S603: Determine whether the test is activated; if yes, proceed to S604; if no, reactivate the test;

[0146] S604: Locking clutch engaged, dog clutch engaged;

[0147] S605: Determine whether the automatic transmission is ready; if yes, proceed to S606; if no, delay for a while and re-determine whether the automatic transmission is ready;

[0148] S606: Controlling input torque through the input motor;

[0149] S607: Determine whether the input torque is in place; if yes, proceed to S608; if no, proceed to S606;

[0150] S608: The disengagement force test starts;

[0151] S609: Determine whether the test is completed; if yes, proceed to S610; if no, proceed to S607;

[0152] S610: Determine whether all preset operating points have been traversed; if yes, proceed to S611; if no, proceed to S605;

[0153] S611: End.

[0154] See also Figure 7 , Figure 7 This is a block diagram of a device structure for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application. The device includes:

[0155] A first acquisition unit 710 is used to acquire an input speed and an output speed of the dog clutch; the input speed is the speed of the input end of the dog clutch, and the output speed is the speed of the output end of the dog clutch;

[0156] A first speed adjustment unit 720, configured to adjust the input speed according to a preset input speed, and adjust the output speed according to a preset output speed; the preset input speed and the preset output speed are preset according to a test condition of the dog clutch;

[0157] A first clutch control unit 730, for controlling the dog clutch to engage in response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed;

[0158] The speed difference determination unit 740 is used to determine the speed difference between the two ends of the dog clutch when it is engaged in response to determining that the dog clutch is engaged; the speed difference between the two ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

[0159] Optionally, the device further comprises:

[0160] The third clutch control unit is used to control the dog clutch to disengage in response to determining that the dog clutch fails to engage or the speed difference between the two ends is greater than a preset speed difference threshold.

[0161] Optionally, the first clutch control unit is further used for:

[0162] In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, providing an engagement torque to the dog clutch by increasing an engagement-side cylinder pressure of the dog clutch and / or decreasing a disengagement-side cylinder pressure of the dog clutch;

[0163] The dog clutch is controlled to engage according to the engagement torque.

[0164] See also Figure 8 , Figure 8 This is another device structure block diagram for automatically testing the characteristics of a dog clutch provided in an embodiment of the present application. The device includes:

[0165] The second acquisition unit 810 is used to acquire the current position of the dog clutch and the input speed of the dog clutch; the input speed is the input end speed of the dog clutch;

[0166] A first torque adjustment unit 820, configured to adjust the input torque of the dog clutch according to a preset input torque in response to the current position of the dog clutch being the dog clutch being engaged and the input speed of the dog clutch being greater than or equal to an idle speed;

[0167] A second clutch control unit 830, configured to control the dog clutch to be disengaged in response to determining that the input torque of the dog clutch is equal to a preset input torque;

[0168] The torque determination unit 840 is configured to determine the input torque when the dog clutch is disengaged in response to determining that the dog clutch is disengaged.

[0169] Optionally, the device further comprises:

[0170] The second torque adjustment unit is used for controlling the input speed to zero in response to determining the input torque when the dog clutch is disengaged.

[0171] Optionally, the device further comprises:

[0172] a torque providing unit, configured to provide an engagement torque for the dog clutch by increasing the engagement side cylinder pressure of the dog clutch and / or decreasing the separation side cylinder pressure of the dog clutch in response to a dog position change of the dog clutch being greater than a change threshold or a separation side oil cylinder pressure of the dog clutch reaching a maximum value;

[0173] The fourth clutch control unit is used to control the engagement of the dog clutch according to the engagement torque.

[0174] It can be seen from the above technical scheme that by obtaining the input speed and output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch; according to the input speed and the output speed, the speed difference between the two ends of the dog clutch is calculated; the input speed is adjusted according to the preset input speed, and the output speed is adjusted according to the preset output speed; in response to determining that the input speed is equal to the preset input speed, and the output speed is equal to the preset output speed, the dog clutch is controlled to engage; in response to determining that the dog clutch is engaged, the speed difference between the two ends when the dog clutch is engaged is determined. The input speed and output speed of the dog clutch are automatically corrected by the controller to test the speed difference between the two ends when the dog clutch is engaged, and then the characteristics of the dog clutch are obtained according to the speed difference between the two ends when the dog clutch can be engaged, so as to realize the automated testing of the characteristics of the dog clutch.

[0175] See also Fig. 9 , Fig. 9 This is a block diagram of a computer device for automatic testing of dog clutch characteristics provided in an embodiment of the present application. The computer device includes a processor 910 and a memory 920:

[0176] The memory 920 is used to store program codes and transmit the program codes to the processor 910;

[0177] The processor 910 is used to execute the automatic testing method for dog clutch characteristics as described in any one of the above embodiments according to the instructions in the program code.

[0178] The embodiment of the present application further discloses a computer-readable storage medium, which is used to store a computer program. When the computer program is executed by a processor, it is used to execute the automatic testing method of dog clutch characteristics as described in any one of the above embodiments.

[0179] It is understandable that the method can be applied to a processing device, which is a processing device capable of performing motion control, for example, a terminal device or a server with a motion control function. The method can be executed independently by a terminal device or a server, or can be applied to a network scenario in which a terminal device and a server communicate, and is executed by the cooperation of the terminal device and the server. Among them, the terminal device can be a computer, a mobile phone and other devices. The server can be understood as an application server or a Web server. In actual deployment, the server can be an independent server or a cluster server.

[0180] A person of ordinary skill in the art can understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the above-mentioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the above-mentioned storage medium can be at least one of the following media: read-only memory (English: read-only memory, abbreviated: ROM), RAM, magnetic disk or optical disk, etc. Various media that can store program codes.

[0181] It should be noted that each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments. The device and system embodiments described above are merely schematic, in which the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0182] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for automatically testing the characteristics of a dog clutch, characterized in that: The method comprises: Obtaining the input speed and output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch; The input speed is adjusted according to a preset input speed, and the output speed is adjusted according to a plurality of preset output speeds; the preset input speed and the preset output speed are preset according to a test condition of the dog clutch; In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, controlling the dog clutch to engage; In response to determining that the dog clutch is engaged, the speed difference between both ends of the dog clutch when engaged is determined; the speed difference between both ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

2. The method according to claim 1, characterized in that The method further comprises: In response to determining that the engagement of the dog clutch fails or the speed difference between the two ends is greater than a preset speed difference threshold, the dog clutch is controlled to be disengaged.

3. The method according to claim 1, characterized in that In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, controlling the dog clutch to engage includes: In response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed, providing an engagement torque to the dog clutch by increasing an engagement-side cylinder pressure of the dog clutch and / or decreasing a disengagement-side cylinder pressure of the dog clutch; The dog clutch is controlled to engage according to the engagement torque.

4. A method for automatically testing the characteristics of a dog clutch, characterized in that: The method comprises: Acquire the current position of the dog clutch and the input speed of the dog clutch; the input speed is the input end speed of the dog clutch; In response to the current position of the dog clutch being the dog clutch engaged and the input speed of the dog clutch being greater than or equal to an idle speed, adjusting the input torque of the dog clutch according to a preset input torque; In response to determining that the input torque of the dog clutch is equal to the preset input torque, controlling the dog clutch to be disengaged; In response to determining that the dog clutch is disengaged, an input torque when the dog clutch is disengaged is determined.

5. The method according to claim 4, characterized in that In response to determining that the dog clutch is disengaged, after determining the input torque when the dog clutch is disengaged, the method further includes: In response to determining the input torque when the dog clutch is disengaged, the input speed is controlled to zero.

6. The method according to claim 4, characterized in that The method further comprises: In response to the dog tooth position change of the dog tooth clutch being greater than a change threshold, or the disengagement side oil cylinder pressure of the dog tooth clutch reaching a maximum value, providing engagement torque for the dog tooth clutch by increasing the engagement side oil cylinder pressure of the dog tooth clutch and / or decreasing the disengagement side oil cylinder pressure of the dog tooth clutch; The dog clutch is controlled to engage according to the engagement torque.

7. An automatic testing device for dog clutch characteristics, characterized in that: The device comprises: A first acquisition unit is used to acquire an input speed and an output speed of the dog clutch; the input speed is the input end speed of the dog clutch, and the output speed is the output end speed of the dog clutch; a first speed adjustment unit, configured to adjust the input speed according to a preset input speed, and to adjust the output speed according to a preset output speed; the preset input speed and the preset output speed are preset according to a test condition of the dog clutch; a first clutch control unit, configured to control the dog clutch to engage in response to determining that the input speed is equal to the preset input speed and the output speed is equal to the preset output speed; The speed difference determination unit is used to determine the speed difference between the two ends of the dog clutch when it is engaged in response to determining that the dog clutch is engaged; the speed difference between the two ends of the dog clutch is calculated based on the input end speed and the output end speed when the dog clutch is engaged.

8. An automatic testing device for dog clutch characteristics, characterized in that: The device comprises: A second acquisition unit is used to acquire the current position of the dog clutch and the input speed of the dog clutch; the input speed is the input end speed of the dog clutch; a first torque adjustment unit, configured to adjust the input torque of the dog clutch according to a preset input torque in response to the current position of the dog clutch being the dog clutch being engaged and the input speed of the dog clutch being greater than or equal to an idle speed; a second clutch control unit, configured to control the dog clutch to be disengaged in response to determining that the input torque of the dog clutch is equal to a preset input torque; The torque determination unit is configured to determine an input torque when the dog clutch is disengaged in response to determining that the dog clutch is disengaged.

9. A computer device, characterized in that: The computer device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the automatic testing method for dog clutch characteristics described in any one of claims 1-3 or claims 4-6 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, it is used to execute the automatic testing method of dog clutch characteristics as described in any one of claims 1-3 or claims 4-6.

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