Lubricating flow control method and device of self-circulation clutch, vehicle and medium

Abstract

The invention is suitable for the technical field of vehicles, and provides a lubricating flow control method and device of a self-circulation clutch, a vehicle and a medium. The method comprises the steps that when the self-circulation clutch is in a sliding friction state, whether the sliding friction rotating speed of the self-circulation clutch is larger than a preset first rotating speed threshold value or not is determined; if the sliding friction rotating speed is greater than a first rotating speed threshold value, dividing the subsequent whole sliding friction period into different control stages according to the change state of the sliding friction rotating speed; and in different control stages, the lubricating flow of the self-circulation clutch is controlled according to the corresponding sliding friction rotating speed and the preset lubricating strategy. The lubricating flow of the self-circulation clutch can be dynamically controlled, and precise self-adaptive adjustment of the lubricating flow is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and particularly relates to a lubricating flow control method, device, vehicle and medium for a self-circulating clutch. Background Art

[0002] As a shifting or disconnecting device, the clutch is widely used in hybrid clutches due to its fast response and simple control. When the clutch is working, slip friction energy will be generated due to friction, and the magnitude of the slip friction energy directly affects the overall life and performance of the clutch.

[0003] The self-circulating clutch is a closed clutch structure. When the self-circulating clutch is in slip friction, there is a speed difference between the internal spline friction plate and the external spline friction plate. When the lubricating flow passes through the surface of the external spline friction plate, due to the action of centrifugal force, the lubricating flow flows from the inside to the outside; when the lubricating flow accumulates at the outer shell of the self-circulating clutch to form a pressure, and the rotational speed of the internal spline friction plate is lower than that of the external spline friction plate, the centrifugal force generated by the internal spline friction plate is less than that of the external spline friction plate. Combined with the accumulated pressure, a greater internal and external pressure difference is formed. At this time, the lubricating flow flows through the internal spline friction plate to the inside, thus realizing the lubricating self-circulation function and reducing unnecessary slip friction.

[0004] In the related art, the control of the lubricating flow of the self-circulating clutch is the same as the control method of the torque converter, that is, a fixed lubricating flow is set, and more lubricating flow is used to reduce the system slip friction. However, this method also brings about a situation of waste of lubricating flow, affecting the clutch efficiency. Moreover, a higher lubricating flow will cause a higher back pressure of the clutch. In the case of low lubricating flow demand but high actual lubricating flow, the large back pressure will also affect the life of components and the control accuracy of the clutch. Summary of the Invention

[0005] In view of this, the embodiments of the present invention provide a lubricating flow control method, device, vehicle and medium for a self-circulating clutch, so as to dynamically control the lubricating flow of the self-circulating clutch and realize precise adaptive adjustment of the lubricating flow.

[0006] The first aspect of the embodiments of the present invention provides a lubricating flow control method for a self-circulating clutch, including:

[0007] When the self-circulating clutch is in a slip friction state, determining whether the slip friction rotational speed of the self-circulating clutch is greater than a preset first rotational speed threshold;

[0008] If the slip friction rotational speed is greater than the first rotational speed threshold, then according to the change state of the slip friction rotational speed, the entire subsequent slip friction cycle is divided into different control stages;

[0009] In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding rotation speed and the preset lubrication strategy.

[0010] When the self-circulating clutch enters the slipping working state, the system will start monitoring the slipping speed. In different control stages, combined with the slipping speed of the corresponding stage, different preset lubrication strategies are implemented to accurately control the lubrication flow of the self-circulating clutch. By dividing the control stages and adjusting the lubrication flow in a targeted manner, the lubricant supply can be highly matched with the actual needs of the clutch.

[0011] In a possible implementation, the entire subsequent sliding cycle is divided into different control stages according to the change state of the sliding speed, including:

[0012] After the friction cycle starts, the stage when the friction speed is in the first stable state is determined as the initial stage;

[0013] After the initial stage, the stage in which the sliding speed is in a changing state is determined as the process stage;

[0014] After the process stage is over, the stage when the sliding speed is in the second stable state is determined as the final stage;

[0015] Among them, the first stable state is a state in which the change of the sliding speed is within a first preset change range, the change state is a state in which the change of the sliding speed exceeds a second preset change range, the second stable state is a state in which the change of the sliding speed is within a third preset change range, and the upper limit value of the second preset change range is greater than the upper limit value of the first preset change range, and greater than the upper limit value of the third preset change range.

[0016] The lubrication requirements of the self-circulating clutch vary significantly under different sliding conditions. By dividing the self-circulating clutch sliding cycle into three stages, namely the initial, process and final stages, this refined processing can significantly optimize system performance and have a positive impact in improving control accuracy, enhancing system stability and extending equipment life.

[0017] In a possible implementation, in different control stages, controlling the lubrication flow of the self-circulating clutch according to the corresponding sliding speed and the preset lubrication strategy includes:

[0018] In the initial stage, the hardware parameters of the self-circulating clutch are obtained; wherein the hardware parameters include the cross-sectional area of ​​the friction plate groove;

[0019] Determining an initial lubrication flow rate according to the sliding rotation speed and the cross-sectional area of ​​the friction plate groove; the initial lubrication flow rate is positively correlated with the sliding rotation speed and the cross-sectional area of ​​the friction plate groove;

[0020] Control the lubrication flow rate of the self - circulating clutch according to the initial lubrication flow rate.

[0021] In the initial stage, the sliding friction speed is greater than the first speed threshold and relatively stable. The clutch has a self - circulating function, and relatively basic control parameters can be combined with the sliding friction speed to control the lubrication flow rate.

[0022] In a possible implementation manner, in different control stages, according to the corresponding sliding friction speed and a preset lubrication strategy, controlling the lubrication flow rate of the self - circulating clutch includes:

[0023] In the process stage, determine whether the sliding friction speed of the self - circulating clutch is greater than the first speed threshold;

[0024] If the sliding friction speed is greater than or equal to the first speed threshold, determine a first dynamic lubrication flow rate according to the sliding friction speed and the cross - sectional area of the friction plate grooves; control the lubrication flow rate of the self - circulating clutch according to the first dynamic lubrication flow rate; wherein, the first dynamic lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross - sectional area of the friction plate grooves;

[0025] If the sliding friction speed is less than the first speed threshold, determine the fixed lubrication flow rate corresponding to the sliding friction speed in the final stage according to the preset corresponding relationship between the sliding friction speed and the fixed lubrication flow rate, and determine a second dynamic lubrication flow rate according to the difference between the initial lubrication flow rate and the fixed lubrication flow rate; control the lubrication flow rate of the self - circulating clutch according to the second dynamic lubrication flow rate; wherein, the second dynamic lubrication flow rate is positively correlated with the difference between the initial lubrication flow rate and the fixed lubrication flow rate.

[0026] In the process stage, since the sliding friction speed may decrease or increase, for the decreasing condition, when the sliding friction speed is less than the first speed threshold, the self - circulating clutch no longer has the self - circulating function. At this time, the target sliding friction speed in the final stage can be predicted first to determine the final lubrication flow rate in the final stage, and the second dynamic lubrication flow rate can be determined according to the difference between the initial lubrication flow rate and the final lubrication flow rate, so as to achieve a smooth reduction transition of the lubrication flow rate and improve the system stability.

[0027] In a possible implementation manner, in different control stages, according to the corresponding sliding friction speed and a preset lubrication strategy, controlling the lubrication flow rate of the self - circulating clutch includes:

[0028] In the final stage, determine whether the sliding friction speed of the self - circulating clutch is greater than the first speed threshold;

[0029] If the sliding friction speed is greater than or equal to the first speed threshold, determine the first final lubrication flow rate according to the sliding friction speed and the cross-sectional area of the friction plate groove; control the lubrication flow rate of the self-circulating clutch according to the first final lubrication flow rate; wherein, the first final lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate groove;

[0030] If the sliding friction speed is less than the first speed threshold, determine the fixed lubrication flow rate as the second final lubrication flow rate; control the lubrication flow rate of the self-circulating clutch according to the second final lubrication flow rate.

[0031] In the final stage, if the sliding friction speed is less than the first speed threshold and the final lubrication flow rate is only related to the clutch structure itself, use the fixed lubrication flow rate to ensure basic lubrication.

[0032] In a possible implementation manner, the controlling the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and the preset lubrication strategy in different control stages includes:

[0033] In each control stage, obtain the temperature of at least one key part of the self-circulating clutch;

[0034] Judge whether the self-circulating clutch has a maximum lubrication flow rate requirement according to the temperature of the at least one key part;

[0035] If the self-circulating clutch has a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the preset maximum lubrication flow rate;

[0036] If the self-circulating clutch does not have a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and the preset lubrication strategy.

[0037] During the entire working process of the self-circulating clutch, the system will obtain the temperature of its key parts in real time at each control stage and, taking this as the core basis, dynamically adjust the lubrication flow rate. This control strategy can achieve protection when the temperature of the self-circulating clutch is high and is remarkable in optimizing the heat dissipation effect, extending the equipment life, reducing energy consumption, etc.

[0038] In a possible implementation manner, the temperature of the key part includes: the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil sump;

[0039] The judging whether the self-circulating clutch has a maximum lubrication flow rate requirement according to the temperature of the at least one key part includes:

[0040] If any one of the inter-chip temperature, the oil outlet temperature, and the oil pan temperature is greater than the corresponding preset temperature threshold, it is determined that the self-circulating clutch has a maximum lubrication flow rate requirement.

[0041] Under different working conditions, the heat generation situation of the self-circulating clutch is different. This temperature determination method enables the system to accurately judge the lubrication requirement under complex working conditions. When the temperature is normal, the lubrication flow rate is controlled according to the conventional strategy. When the temperature is abnormal, the maximum lubrication flow rate is provided in a timely manner, which not only avoids the problems caused by insufficient lubrication but also prevents the waste of resources caused by excessive lubrication, improving the adaptability and operating efficiency of the system.

[0042] In a possible implementation manner, the method further includes:

[0043] Obtain the sliding friction speed and the requested torque of the self-circulating clutch;

[0044] If the sliding friction speed is greater than a preset second speed threshold and the requested torque is greater than a preset torque threshold, it is determined that the self-circulating clutch is in a sliding friction state;

[0045] Wherein, the second speed threshold is less than the first speed threshold.

[0046] Under different working scenarios, the working state of the self-circulating clutch will change. The sliding friction state determination method based on the sliding friction speed and the requested torque enables the system to quickly adapt to the changes in various working conditions, accurately identify the sliding friction state of the clutch, and timely adjust the control strategy to ensure that the clutch is always in the best working state, improving the overall performance and working efficiency of the equipment.

[0047] A second aspect of the embodiments of the present invention provides a lubrication flow rate control device for a self-circulating clutch, including:

[0048] A determination module, configured to determine whether the sliding friction speed of the self-circulating clutch is greater than a preset first speed threshold when the self-circulating clutch is in a sliding friction state;

[0049] A processing module, configured to, if the sliding friction speed is greater than the first speed threshold, divide the entire subsequent sliding friction cycle into different control stages according to the change state of the sliding friction speed; and control the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and a preset lubrication strategy in different control stages.

[0050] In a possible implementation manner, the processing module is configured to:

[0051] Determine the stage where the sliding friction speed is in the first stable state after the start of the sliding friction cycle as the initial stage;

[0052] After the initial stage ends, the stage in which the sliding friction speed is in a changing state is determined as the process stage;

[0053] After the process stage ends, the stage in which the sliding friction speed is in the second stable state is determined as the final stage;

[0054] Among them, the first stable state is the state in which the change of the sliding friction speed is within the first preset change range, the changing state is the state in which the change of the sliding friction speed exceeds the second preset change range, the second stable state is the state in which the change of the sliding friction speed is within the third preset change range, the upper limit value of the second preset change range is greater than the upper limit value of the first preset change range, and is greater than the upper limit value of the third preset change range.

[0055] In a possible implementation manner, the processing module is configured to:

[0056] During the initial stage, obtain the hardware parameters of the self-circulating clutch; among them, the hardware parameters include the cross-sectional area of the friction plate grooves;

[0057] According to the sliding friction speed and the cross-sectional area of the friction plate grooves, determine the initial lubrication flow rate; the initial lubrication flow rate is positively correlated with the sliding friction speed and is positively correlated with the cross-sectional area of the friction plate grooves;

[0058] According to the initial lubrication flow rate, control the lubrication flow rate of the self-circulating clutch.

[0059] In a possible implementation manner, the processing module is configured to:

[0060] During the process stage, determine whether the sliding friction speed of the self-circulating clutch is greater than the first speed threshold;

[0061] If the sliding friction speed is greater than or equal to the first speed threshold, then according to the sliding friction speed and the cross-sectional area of the friction plate grooves, determine the first dynamic lubrication flow rate; according to the first dynamic lubrication flow rate, control the lubrication flow rate of the self-circulating clutch; among them, the first dynamic lubrication flow rate is positively correlated with the sliding friction speed and is positively correlated with the cross-sectional area of the friction plate grooves;

[0062] If the sliding friction speed is less than the first speed threshold, then according to the preset correspondence between the sliding friction speed and the fixed lubrication flow rate, determine the fixed lubrication flow rate corresponding to the sliding friction speed in the final stage, and according to the difference between the initial lubrication flow rate and the fixed lubrication flow rate, determine the second dynamic lubrication flow rate; according to the second dynamic lubrication flow rate, control the lubrication flow rate of the self-circulating clutch; among them, the second dynamic lubrication flow rate is positively correlated with the difference between the initial lubrication flow rate and the fixed lubrication flow rate.

[0063] In a possible implementation manner, the processing module is configured to:

[0064] At the final stage, determine whether the slip friction speed of the self-circulating clutch is greater than the first speed threshold;

[0065] If the slip friction speed is greater than or equal to the first speed threshold, determine a first final lubrication flow rate according to the slip friction speed and the cross-sectional area of the friction plate grooves; control the lubrication flow rate of the self-circulating clutch according to the first final lubrication flow rate; wherein, the first final lubrication flow rate is positively correlated with the slip friction speed and is positively correlated with the cross-sectional area of the friction plate grooves;

[0066] If the slip friction speed is less than the first speed threshold, determine the fixed lubrication flow rate as the second final lubrication flow rate; control the lubrication flow rate of the self-circulating clutch according to the second final lubrication flow rate.

[0067] In a possible implementation manner, the processing module is configured to:

[0068] At each control stage, obtain the temperature of at least one key part of the self-circulating clutch;

[0069] Judge whether the self-circulating clutch has a maximum lubrication flow rate requirement according to the temperature of the at least one key part;

[0070] If the self-circulating clutch has a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the preset maximum lubrication flow rate;

[0071] If the self-circulating clutch does not have a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the corresponding slip friction speed and the preset lubrication strategy.

[0072] In a possible implementation manner, the temperature of the key part includes: the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil sump;

[0073] The processing module is configured to:

[0074] If any one of the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil sump is greater than the corresponding preset temperature threshold, determine that the self-circulating clutch has a maximum lubrication flow rate requirement.

[0075] In a possible implementation manner, the determining module is further configured to:

[0076] Obtain the slip friction speed and the requested torque of the self-circulating clutch;

[0077] If the sliding friction speed is greater than a preset second speed threshold and the requested torque is greater than a preset torque threshold, it is determined that the self-circulating clutch is in a sliding friction state;

[0078] Wherein, the second speed threshold is less than the first speed threshold.

[0079] A third aspect of the embodiments of the present invention provides a vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the first aspect or any possible implementation manner of the first aspect are implemented.

[0080] A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps in the first aspect or any possible implementation manner of the first aspect are implemented.

[0081] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows:

[0082] When the self-circulating clutch is in a sliding friction state in the embodiments of the present invention, if the sliding friction speed of the self-circulating clutch is greater than the first speed threshold, then by dividing the entire subsequent sliding friction cycle into different control stages, in different control stages, according to the corresponding sliding friction speed and a preset lubrication strategy, the lubrication flow rate of the self-circulating clutch is controlled. By associating the lubrication flow rate with the sliding friction speed, adaptive dynamic lubrication flow rate control is achieved, solving the static matching defect of the traditional lubrication scheme, and achieving significant improvements in thermal management, energy consumption, and response speed; by implementing different preset lubrication strategies in different control stages, the optimal matching of the lubrication flow rate is further achieved, improving the control accuracy. The embodiments of the present invention can effectively reduce the back pressure of the self-circulating clutch, thereby reducing the component design requirements and extending the component life. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0084] Figure 1 is a schematic diagram of the application scenario of the lubrication flow rate control method for the self-circulating clutch provided by the embodiments of the present invention;

[0085] Figure 2 is a schematic diagram of the implementation process of the lubrication flow rate control method for the self-circulating clutch provided by the embodiments of the present inventionFigure 1 ;

[0086] Figure 3 is a schematic diagram of the control stage division provided by the embodiments of the present invention Figure 1 ;

[0087] Figure 4 is a schematic diagram of the control stage division provided by the embodiments of the present invention Figure 2 ;

[0088] Figure 5 is a schematic diagram of the implementation process of the lubricating flow control method for the self - circulating clutch provided by the embodiments of the present invention Figure 2 ;

[0089] Figure 6 is a schematic structural diagram of the lubricating flow control device for the self - circulating clutch provided by the embodiments of the present invention;

[0090] Figure 7 is a schematic structural diagram of the vehicle provided by the embodiments of the present invention. Detailed Embodiments

[0091] The following further clarifies the present application with specific embodiments. The following embodiments will help those skilled in the art further understand the function of the present application, but do not limit the present application in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made. These all belong to the protection scope of the present application.

[0092] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0093] It should also be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0094] In the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0095] Reference to "one embodiment" or "some embodiments" etc. described in the specification of this application means that in one or more embodiments of this application, specific features, structures or characteristics described in connection with that embodiment are included. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have" and their variants all mean "include but not limited to", unless otherwise specifically emphasized in other ways.

[0096] In addition, "a plurality of" mentioned in the embodiments of this application should be construed as two or more.

[0097] The self-circulating clutch is a clutch with a unique lubrication mechanism, and usually adopts solutions such as a closed design, a single-sided friction plate and a toothless design. Compared with traditional clutches, the oil passage design of the self-circulating clutch is more complex and delicate to achieve efficient circulation of lubricating oil, and is equipped with special flow control devices and heat dissipation structures to ensure the normal operation of the clutch under different working conditions.

[0098] The working principle of the self-circulating clutch is as follows:

[0099] When the clutch is in sliding friction, there is a speed difference between the internal spline friction plate and the external spline friction plate. When the lubricating flow passes through the surface of the external spline friction plate, due to the action of centrifugal force, the lubricating flow flows from the inside to the outside. When the lubricating flow accumulates at the clutch housing to form a pressure, and the rotational speed of the internal spline friction plate is lower than that of the external spline friction plate, so the centrifugal force generated by the internal spline friction plate is less than that of the external spline friction plate. Combined with the accumulated pressure, a greater internal and external pressure difference is formed. At this time, the lubricating flow flows through the internal spline friction plate to the inside, thus realizing the self-circulation function of the clutch. When the sliding friction of the clutch is small / there is no sliding friction, the lubricating flow is under the action of centrifugal force when passing through the surfaces of both the external spline friction plate and the internal spline friction plate. Therefore, the lubricating flow is from the inside to the side of the clutch housing, and the self-circulation function disappears.

[0100] In the related art, the lubrication flow rate of the self-circulating clutch is consistent with the control method of the torque converter, that is, a strategy of fixed input lubrication flow rate is adopted. During the operation of the system, a relatively large lubrication flow rate will be input to ensure the lubrication effect of the system. This control method can indeed quickly cool down and enable lubrication to play its due role under the working conditions with low clutch slip energy. However, this control method has obvious drawbacks. On the one hand, the input of a large amount of unnecessary lubrication flow rate directly causes waste of lubricant. On the other hand, in the scenario of a closed clutch, when the system actually only requires a low lubrication flow rate, the excessive lubrication flow rate will make the back pressure far exceed the normal level, which not only damages the service life of the internal components of the clutch, reduces its durability, but also seriously interferes with the control accuracy of the clutch, resulting in hysteresis and inaccurate actions during the engagement and disengagement processes of the clutch, and affecting the stability and reliability of power transmission.

[0101] To solve the above problems, the present invention proposes a lubrication flow rate control method for a self-circulating clutch. By correlating the lubrication flow rate with the slip speed, through a dynamic flow rate model coupled with the slip working conditions, a phased control logic, and a slip speed threshold trigger mechanism, precise adaptive adjustment of the lubrication flow rate is achieved. The following is illustrated by specific embodiments.

[0102] Figure 1 It is a schematic diagram of the application scenario of the lubrication flow rate control method for the self-circulating clutch provided by the embodiment of the present invention.

[0103] In this embodiment, the lubrication flow rate control method of the self-circulating clutch can be integrated as a program in devices such as the vehicle controller and processor to achieve the control of the lubrication flow rate. For example, this method can be implemented through the vehicle's Electronic Control Unit (ECU). The ECU is also known as the "vehicle computer", "on-board computer", etc. The ECU can collect real-time data of vehicle operation through various sensors, and according to the preset programs and algorithms, analyze and process the collected data, judge the current operation state of the vehicle, and determine the corresponding control strategy. According to the results of data analysis, the ECU can send control instructions to each actuator to achieve precise control of various vehicle systems.

[0104] Here, the ECU mainly collects data of sensors related to lubrication flow rate control, such as speed sensors, torque sensors, lubrication pressure sensors, etc. Among them, the speed sensor can adopt a magnetoelectric speed sensor, which can be respectively installed at fixed positions near the outer spline and inner spline of the clutch. When the outer spline or inner spline rotates with the friction plate, the tooth tips and tooth valleys will alternately pass through the sensing head of the sensor, causing the magnetic resistance in the magnetic circuit to change, thereby generating an alternating induced electromotive force. The frequency of this electromotive force is proportional to the speed of the spline. By measuring the frequency of the electromotive force, the speed of the friction plate can be calculated.

[0105] All these sensor data can be transmitted via the CAN bus, and the ECU reads the sensor data on the CAN bus. Based on these sensor data, the ECU executes the lubricating flow control method for the self-circulating clutch to generate control instructions. These control instructions can act on the electromagnetic flow control valve of the clutch. The electromagnetic flow control valve adjusts the position of the valve core by changing the duty cycle of the energized electromagnetic coil, thereby precisely controlling the lubricating oil flow rate into the clutch.

[0106] The following Figure 1 application scenario will be combined with Figure 2 to describe the lubricating flow control method for the self-circulating clutch provided according to the exemplary embodiments of the present application. It should be noted that the above application scenario is only shown for the convenience of understanding the spirit and principle of the present application, and the embodiments of the present application are not limited in this regard. On the contrary, the embodiments of the present application can be applied to any applicable scenario.

[0107] The following Figure 2 shown will be used to elaborate on the method of this embodiment in detail:

[0108] Step S201, when the self-circulating clutch is in the slip friction state, determine whether the slip friction speed of the self-circulating clutch is greater than a preset first speed threshold.

[0109] The slip friction state of the clutch refers to the working state where there is a speed difference between the driving part and the driven part of the clutch, and relative sliding occurs. Therefore, the slip friction speed ω 滑摩 of the clutch can be defined as the absolute value of the difference between the speed ω 外 of the outer spline friction plate and the speed ω 内 of the inner spline friction plate, that is:

[0110] ω 滑摩 =|ω 外 - ω 内 |

[0111] In this embodiment, the state of the self-circulating clutch is divided into an open state, a slip friction state, and a closed state. The open state means that there is no torque loading on the self-circulating clutch (or the clutch request torque is less than the preset torque threshold); the slip friction state means that the clutch has a slip friction speed (or the slip friction speed exceeds a certain speed threshold), and there is torque loading (or the clutch request torque is greater than the preset torque threshold); the closed state is that the clutch has no slip friction speed (or the slip friction speed is lower than a certain speed threshold), and there is torque loading (or the clutch request torque is greater than the preset torque threshold).

[0112] Exemplarily, when the ECU of the vehicle detects that the slip friction speed is greater than the second speed threshold (10 - 20 r / min) and the clutch requested torque is greater than the preset torque threshold, it can be determined that the self-circulating clutch is in the slip friction state. The lubrication flow control method of this embodiment is mainly applied to the slip friction state of the self-circulating clutch. When the clutch is in other states, only the minimum lubrication flow needs to be ensured.

[0113] Step S202, if the slip friction speed is greater than the first speed threshold, then according to the change state of the slip friction speed, the entire subsequent slip friction period is divided into different control stages.

[0114] In the slip friction state, when the ECU detects that the slip friction speed of the clutch is greater than the first speed threshold (for example, 500 r / min), the lubrication flow control method needs to be started.

[0115] During the entire period of slip friction of the self-circulating clutch, the slip friction speed will change. Therefore, according to the change of the slip friction speed, the entire period can be divided into different control stages, and different control strategies are executed in different control stages.

[0116] Exemplarily, during the entire period of slip friction of the self-circulating clutch, the change of the slip friction speed is usually as Figure 2 and Figure 3 shown. That is: it remains stable at the beginning, then fluctuates, and finally gradually tends to a stable target slip friction speed. Therefore, this embodiment can divide the entire slip friction period into an initial stage, a process stage, and a final stage.

[0117] The initial stage refers to the period when the slip friction speed shows the first stable state after the start of the slip friction period. Here, the first stable state means that the slip friction speed remains unchanged or the fluctuation is very small (limited within the first preset change range).

[0118] After the end of the initial stage, it enters the process stage. The significant feature of this stage is that the slip friction speed is in a changing state, that is, the change range of the slip friction speed is relatively large (exceeding the second preset change range, and the upper limit value of the second preset change range is greater than the upper limit value of the first preset change range).

[0119] When the process stage ends, the slip friction speed enters the final stage of the second stable state. The second stable state also means that the slip friction speed remains unchanged or the fluctuation is very small (limited within the third preset change range), the upper limit value of the third preset change range is less than the upper limit value of the second preset change range, and the third preset change range can be the same as the first preset change range.

[0120] Step S203: In different control stages, control the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and the preset lubrication strategy.

[0121] In different control stages, due to the changing characteristics of the sliding friction speed and different control requirements, by dividing the control stages to execute the lubrication strategy, the self-circulating clutch can quickly respond to the changes in working conditions. Whether it is the stable stage or the fluctuating stage of the sliding friction speed, the system can quickly react, optimize the lubrication flow rate, enhance the adaptability to different working conditions, and improve the working efficiency of the entire system. At the same time, the phased control method based on the sliding friction speed and the preset lubrication strategy significantly enhances the control accuracy of the lubrication flow rate of the self-circulating clutch. Compared with the traditional extensive lubrication control, this method can achieve precise regulation according to the actual working conditions, ensuring that the clutch can perform optimally under various conditions.

[0122] In the embodiment of the present invention, when the self-circulating clutch is in the sliding friction state, if the sliding friction speed of the self-circulating clutch is greater than the first speed threshold, then by dividing the entire subsequent sliding friction cycle into different control stages, in different control stages, control the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and the preset lubrication strategy. By associating the lubrication flow rate with the sliding friction speed, adaptive dynamic lubrication flow rate control is achieved, solving the static matching defect of the traditional lubrication scheme, and achieving significant improvements in thermal management, energy consumption, and response speed; by executing different preset lubrication strategies in different control stages, the optimal matching of the lubrication flow rate is further realized, improving the control accuracy. The embodiment of the present invention can effectively reduce the back pressure of the self-circulating clutch, thereby reducing the design requirements of components and improving the service life of components.

[0123] In some embodiments, taking the initial stage, process stage, and final stage divided above as an example, in different control stages, control the lubrication flow rate of the self-circulating clutch according to the corresponding sliding friction speed and the preset lubrication strategy, which can be achieved by the following methods:

[0124] (1) Initial stage

[0125] In the initial stage, obtain the hardware parameters of the self-circulating clutch; wherein, the hardware parameters include the cross-sectional area of the friction plate grooves; determine the initial lubrication flow rate according to the sliding friction speed and the cross-sectional area of the friction plate grooves; the initial lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate grooves; control the lubrication flow rate of the self-circulating clutch according to the initial lubrication flow rate.

[0126] The initial lubrication flow rate is strongly correlated with the sliding friction speed of the clutch and can be obtained based on the steady-state sliding friction speed of the clutch combined with the hardware parameters. The calculation formula can be:

[0127]

[0128] Among them, Q 初始 (t) is the initial lubrication flow rate at time t, k is a constant, S is the cross-sectional area of the friction plate groove, and ω(t) 外 is the rotational speed of the external spline friction plate at time t, and ω(t) 内 is the rotational speed of the internal spline friction plate at time t. Q0 is the initial lubrication constant, and this parameter can be corrected according to the lubrication simulation model.

[0129] (2) Process stage

[0130] According to Figure 2 and Figure 3 , the sliding friction speed may decrease or increase. For the decreasing condition, when the sliding friction speed is less than the first speed threshold, the self-circulating clutch no longer has the self-circulating function. Therefore, during the process stage, it is necessary to determine whether the sliding friction speed of the self-circulating clutch is still greater than the first speed threshold, and according to the judgment result, execute the corresponding control strategy.

[0131] If the sliding friction speed is greater than or equal to the first speed threshold, the self-circulating clutch has the self-circulating function. At this time, the lubrication flow rate can still be determined according to the calculation formula shown in the initial stage. That is, according to the sliding friction speed and the cross-sectional area of the friction plate groove, determine the first dynamic lubrication flow rate; according to the first dynamic lubrication flow rate, control the lubrication flow rate of the self-circulating clutch; among them, the first dynamic lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate groove.

[0132] If the sliding friction speed is less than the first speed threshold, the self-circulating clutch does not have the self-circulating function, and the calculation formula shown in the initial stage is no longer applicable. At this time, the target sliding friction speed in the final stage can be predicted first to determine the final lubrication flow rate in the final stage (when the target sliding friction speed is less than the second speed setting threshold, the final lubrication flow rate is only related to the clutch structure itself. Generally, the final lubrication setting near the closed state is set as a fixed lubrication flow rate Q1, or the fixed lubrication flow rate Q1 corresponding to the sliding friction speed in the final stage can be determined according to the preset corresponding relationship between the sliding friction speed and the fixed lubrication flow rate), and according to the difference between the initial lubrication flow rate and Q1, determine the second dynamic lubrication flow rate; according to the second dynamic lubrication flow rate, control the lubrication flow rate of the self-circulating clutch.

[0133] Among them, the second dynamic lubrication flow rate is positively correlated with the difference between the initial lubrication flow rate and the fixed lubrication flow rate. Because the lubrication flow rate in the process stage is the intermediate quantity between the initial lubrication flow rate and the final lubrication flow rate, it has a relatively large correlation with the initial lubrication flow rate, the final lubrication flow rate, and the change time of the sliding friction speed. And due to the difference in the final lubrication flow rate, the lubrication flow rate in the process stage needs to be confirmed according to the difference between the initial lubrication flow rate and the fixed lubrication flow rate. For example, if the sliding friction speed is less than the first speed threshold, the lubrication flow rate can be gradually reduced over time to achieve a smooth transition, which is expressed by the formula:

[0134]

[0135] Among them, Q 过程 (t) is the lubrication flow rate at the process stage at time t, and Q 初始 (0) is the initial lubrication flow rate, and t (the target sliding friction time) is the time from the steady-state sliding friction speed to the target sliding friction speed. This time is a calibrated process parameter.

[0136] (3) Final stage

[0137] In the final stage, if the sliding friction speed is greater than or equal to the first speed threshold, the first final lubrication flow rate is determined according to the sliding friction speed and the cross-sectional area of the friction plate groove; according to the first final lubrication flow rate, the lubrication flow rate of the self-circulating clutch is controlled; among them, the first final lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate groove. That is, the calculation formula shown in the initial stage.

[0138] If the sliding friction speed is less than the first speed threshold, the final lubrication flow rate is only related to the clutch structure itself, then the fixed lubrication flow rate Q1 is determined as the second final lubrication flow rate; according to the second final lubrication flow rate, the lubrication flow rate of the self-circulating clutch is controlled.

[0139] It is expressed by the formula:

[0140]

[0141] Among them, Q 最终 (t) is the final lubrication flow rate at time t.

[0142] The traditional lubrication flow rate between the clutch plates is independent of the sliding friction speed and is only equivalent to the lubrication flow rate at the oil inlet and outlet. The difference between this embodiment and the traditional method is that: the lubrication flow rate between the friction plates is related to the sliding friction speed of the clutch and is independent of the lubrication flow rate at the oil inlet and outlet. Thus, an adaptive adjustment of the clutch lubrication flow rate based on the lubrication demand can be achieved.

[0143] In some embodiments, in order to achieve protection when the temperature of the self-circulating clutch is relatively high, the lubrication flow rate control method of the self-circulating clutch can also be as Figure 5 shown:

[0144] Step 1, when the sliding friction speed of the clutch is greater than the second speed threshold (10 - 20 r / min) and the clutch requested torque is greater than the preset torque threshold, it is determined that the self-circulating clutch is in the sliding friction state.

[0145] Step 2: When the clutch slip friction speed is greater than the first speed threshold (500 r / min), obtain the temperatures of at least one key part of the self-circulating clutch; based on the temperatures of at least one key part, determine whether the self-circulating clutch has a maximum lubrication flow rate requirement. If the self-circulating clutch does not have a maximum lubrication flow rate requirement, then proceed to Step 3. Otherwise, control the lubrication flow rate of the self-circulating clutch according to the corresponding slip friction speed and the preset lubrication strategy, that is, proceed to Step 4.

[0146] It should be noted that, in order to achieve protection when the temperature of the self-circulating clutch is relatively high, during the three stages (initial stage, process stage, and final stage) of the entire control cycle, as long as the clutch slip friction speed is greater than the first speed threshold (500 r / min), the temperature judgment strategy is executed. If the temperature judgment result shows a maximum lubrication flow rate requirement, then execute the maximum lubrication flow rate requirement. If the temperature judgment result shows no maximum lubrication flow rate requirement, then execute the preset lubrication strategy within the above stages.

[0147] Here, the temperatures of the key parts may include but are not limited to: the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil pan. The temperature between the clutch plates and the temperature at the oil outlet can be calculated based on the clutch thermal model, and the temperature between the plates and the temperature at the oil outlet are confirmed through the oil liquid interaction process.

[0148] The control logic of the clutch thermal model is that heat is generated by the clutch slip friction, and the generated heat is carried away by the lubrication flow rate obtained from the self-circulating lubrication strategy. The remaining heat causes heat generation between the friction plates, forming the temperature between the plates, and the heat carried away will increase the temperature at the oil outlet.

[0149] The calculation of the temperature between the clutch heat plates is as follows:

[0150]

[0151] Among them, T clu (t + 1) is the temperature between the clutch plates at the (t + 1)th moment, Tq clu (t + 1) is the clutch load torque at the (t + 1)th moment, ω 滑摩 (t + 1) is the clutch slip friction speed at the (t + 1)th moment, T clu (t) is the temperature between the clutch plates at the tth moment, T oil (t) is the temperature at the clutch oil inlet at the tth moment, h(Q oilin , ω 滑摩 ) is the heat transfer coefficient between the clutch plates and the lubricating oil, which is obtained by looking up the table according to the self-circulating strategy flow rate and the clutch slip friction speed, Cp clu is the specific heat capacity of the clutch, and n is the number of friction pairs.

[0152] The calculation of the clutch oil outlet is as follows:

[0153]

[0154] Among them, T oilout (t + 1) is the temperature of the oil outlet at the moment of t + 1, and T oilout (t) is the temperature of the oil outlet at the moment of t, and Cp oil is the specific heat capacity of the oil.

[0155] Step 3: If the self - circulating clutch has a maximum lubrication flow rate requirement, control the lubrication flow rate of the self - circulating clutch according to the preset maximum lubrication flow rate.

[0156] Exemplarily, if any one of the inter - plate temperature, the oil outlet temperature, and the oil pan temperature is greater than the corresponding preset temperature threshold, it is determined that the self - circulating clutch has a maximum lubrication flow rate requirement.

[0157] Step 4: If the self - circulating clutch has no maximum lubrication flow rate requirement, determine the current control stage. In the current control stage, control the lubrication flow rate of the self - circulating clutch according to the corresponding slip friction speed and the preset lubrication strategy. For the specific implementation method, refer to the above - mentioned embodiments and will not be elaborated here.

[0158] In this embodiment, by monitoring the state and parameters of the self - circulating clutch, it is confirmed whether there is slip friction; when the self - circulating clutch is in the slip - friction state, a phased lubrication flow rate control is started, realizing an adaptive dynamic lubrication flow rate control, achieving the best matching of the lubrication flow rate, and improving the control accuracy; at the same time, the inter - plate temperature, the oil outlet temperature, and the oil pan temperature of the clutch friction plates are monitored in real time to confirm whether there is a maximum lubrication flow rate requirement. If so, directly execute the maximum lubrication flow rate to achieve protection when the temperature of the self - circulating clutch is relatively high. This embodiment can significantly improve the service life of the self - circulating clutch.

[0159] It should be understood that the magnitudes of the sequence numbers of the steps in the above - mentioned embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0160] Figure 6 is a schematic structural diagram of the lubrication flow rate control device 60 of the self - circulating clutch provided by the embodiment of the present invention, including:

[0161] A determination module 61, configured to determine whether the slip friction speed of the self - circulating clutch is greater than a preset first speed threshold when the self - circulating clutch is in the slip - friction state;

[0162] A processing module 62, configured to, if the slip friction speed is greater than the first speed threshold, divide the subsequent entire slip - friction cycle into different control stages according to the change state of the slip friction speed; in different control stages, control the lubrication flow rate of the self - circulating clutch according to the corresponding slip friction speed and the preset lubrication strategy.

[0163] In a possible implementation, the processing module 62 is configured to:

[0164] Determine the initial stage as the stage where the sliding friction speed is in the first stable state after the start of the sliding friction cycle;

[0165] Determine the process stage as the stage where the sliding friction speed is in a changing state after the end of the initial stage;

[0166] Determine the final stage as the stage where the sliding friction speed is in the second stable state after the end of the process stage;

[0167] Wherein, the first stable state is the state where the change in the sliding friction speed is within the first preset change range, the changing state is the state where the change in the sliding friction speed exceeds the second preset change range, the second stable state is the state where the change in the sliding friction speed is within the third preset change range, the upper limit value of the second preset change range is greater than the upper limit value of the first preset change range, and greater than the upper limit value of the third preset change range.

[0168] In a possible implementation, the processing module 62 is configured to:

[0169] Obtain the hardware parameters of the self-circulating clutch during the initial stage; wherein, the hardware parameters include the cross-sectional area of the friction plate grooves;

[0170] Determine the initial lubrication flow rate according to the sliding friction speed and the cross-sectional area of the friction plate grooves; the initial lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate grooves;

[0171] Control the lubrication flow rate of the self-circulating clutch according to the initial lubrication flow rate.

[0172] In a possible implementation, the processing module 62 is configured to:

[0173] Determine whether the sliding friction speed of the self-circulating clutch is greater than the first speed threshold during the process stage;

[0174] If the sliding friction speed is greater than or equal to the first speed threshold, determine the first dynamic lubrication flow rate according to the sliding friction speed and the cross-sectional area of the friction plate grooves; control the lubrication flow rate of the self-circulating clutch according to the first dynamic lubrication flow rate; wherein, the first dynamic lubrication flow rate is positively correlated with the sliding friction speed and positively correlated with the cross-sectional area of the friction plate grooves;

[0175] If the sliding friction speed is less than the first speed threshold, determine the fixed lubrication flow rate corresponding to the sliding friction speed in the final stage according to the preset corresponding relationship between the sliding friction speed and the fixed lubrication flow rate, and determine the second dynamic lubrication flow rate according to the difference between the initial lubrication flow rate and the fixed lubrication flow rate; control the lubrication flow rate of the self-circulating clutch according to the second dynamic lubrication flow rate; wherein, the second dynamic lubrication flow rate is positively correlated with the difference between the initial lubrication flow rate and the fixed lubrication flow rate.

[0176] In a possible implementation, the processing module 62 is configured to:

[0177] At the final stage, determine whether the slip friction speed of the self-circulating clutch is greater than the first speed threshold;

[0178] If the slip friction speed is greater than or equal to the first speed threshold, determine the first final lubrication flow rate according to the slip friction speed and the cross-sectional area of the friction plate grooves; control the lubrication flow rate of the self-circulating clutch according to the first final lubrication flow rate; wherein, the first final lubrication flow rate is positively correlated with the slip friction speed and positively correlated with the cross-sectional area of the friction plate grooves;

[0179] If the slip friction speed is less than the first speed threshold, determine the fixed lubrication flow rate as the second final lubrication flow rate; control the lubrication flow rate of the self-circulating clutch according to the second final lubrication flow rate.

[0180] In a possible implementation, the processing module 62 is configured to:

[0181] At each control stage, obtain the temperature of at least one key part of the self-circulating clutch;

[0182] Judge whether the self-circulating clutch has a maximum lubrication flow rate requirement according to the temperature of at least one key part;

[0183] If the self-circulating clutch has a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the preset maximum lubrication flow rate;

[0184] If the self-circulating clutch does not have a maximum lubrication flow rate requirement, control the lubrication flow rate of the self-circulating clutch according to the corresponding slip friction speed and the preset lubrication strategy.

[0185] In a possible implementation, the temperature of the key part includes: the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil sump;

[0186] The processing module 62 is configured to:

[0187] If any one of the temperature between the plates, the temperature at the oil outlet, and the temperature of the oil sump is greater than the corresponding preset temperature threshold, it is determined that the self-circulating clutch has a maximum lubrication flow rate requirement.

[0188] In a possible implementation, the determination module 62 is further configured to:

[0189] Obtain the slip friction speed and the requested torque of the self-circulating clutch;

[0190] If the slip friction speed is greater than the preset second speed threshold and the requested torque is greater than the preset torque threshold, it is determined that the self-circulating clutch is in a slip friction state;

[0191] Among them, the second rotational speed threshold is less than the first rotational speed threshold.

[0192] In the embodiment of the present invention, when the self-circulating clutch is in a slip friction state, if the slip friction rotational speed of the self-circulating clutch is greater than the first rotational speed threshold, then by dividing the subsequent entire slip friction cycle into different control stages, in different control stages, according to the corresponding slip friction rotational speed and a preset lubrication strategy, the lubrication flow rate of the self-circulating clutch is controlled. By correlating the lubrication flow rate with the slip friction rotational speed, an adaptive dynamic lubrication flow rate control is achieved, solving the static matching defect of the traditional lubrication scheme, and achieving significant improvements in thermal management, energy consumption, and response speed; by implementing different preset lubrication strategies in different control stages, an optimal matching of the lubrication flow rate is further achieved, improving the control accuracy. The embodiment of the present invention can effectively reduce the back pressure of the self-circulating clutch, thereby reducing the component design requirements and improving the component lifespan.

[0193] Figure 7 is a schematic diagram of a vehicle 70 provided by an embodiment of the present invention. As Figure 7 shown, the vehicle 70 of this embodiment includes: a processor 71, a memory 72, and a computer program 73 stored in the memory 72 and executable on the processor 71, such as a lubrication flow rate control program for a self-circulating clutch. When the processor 71 executes the computer program 73, the steps in the above-mentioned embodiments of the lubrication flow rate control method for each self-circulating clutch are implemented, such as Figure 2 the steps S201 to S203 shown. Alternatively, when the processor 71 executes the computer program 73, the functions of each module / unit in the above-mentioned device embodiments are implemented, such as Figure 6 the functions of the modules 61 and 62 shown.

[0194] Exemplarily, the computer program 73 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 72 and executed by the processor 71 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 73 in the vehicle 70.

[0195] The vehicle 70 may include, but is not limited to, a processor 71 and a memory 72. Those skilled in the art can understand that Figure 7 this is merely an example of the vehicle 70 and does not constitute a limitation on the vehicle 70. It may include more or fewer components than shown in the figure, or combine certain components, or have different components. For example, the vehicle 70 may further include input / output devices, network access devices, a bus, etc.

[0196] The so-called processor 71 may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0197] The memory 72 may be an internal storage unit of the vehicle 70, such as the hard disk or memory of the vehicle 70. The memory 72 may also be an external storage device of the vehicle 70, such as a plug-in hard disk equipped on the vehicle 70, a Smart Media Card (SMC), a Secure Digital (SD) card, a FlashCard, etc. Further, the memory 72 may also include both the internal storage unit of the vehicle 70 and the external storage device. The memory 72 is used to store the computer program and other programs and data required by the vehicle 70. The memory 72 may also be used to temporarily store data that has been output or will be output.

[0198] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0199] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0200] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0201] In the embodiments provided by the present invention, it should be understood that the disclosed device / vehicle and method can be implemented in other ways. For example, the device / vehicle embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0202] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0203] In addition, the functional units in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0204] When the integrated module / 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 this understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0205] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A lubrication flow control method for a self-circulating clutch, characterized in that: include: When the self-circulating clutch is in a slipping state, determining whether the slipping speed of the self-circulating clutch is greater than a preset first speed threshold; If the sliding speed is greater than the first speed threshold, dividing the entire sliding cycle into different control stages according to the change state of the sliding speed; In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding rotation speed and the preset lubrication strategy.

2. The lubrication flow control method of the self-circulating clutch according to claim 1, characterized in that: According to the change state of the sliding speed, the entire sliding cycle is divided into different control stages, including: After the friction cycle starts, the stage when the friction speed is in the first stable state is determined as the initial stage; After the initial stage, the stage in which the sliding speed is in a changing state is determined as the process stage; After the process stage is over, the stage when the sliding speed is in the second stable state is determined as the final stage; Among them, the first stable state is a state in which the change of the sliding speed is within a first preset change range, the change state is a state in which the change of the sliding speed exceeds a second preset change range, the second stable state is a state in which the change of the sliding speed is within a third preset change range, and the upper limit value of the second preset change range is greater than the upper limit value of the first preset change range, and greater than the upper limit value of the third preset change range.

3. The lubrication flow control method of the self-circulating clutch according to claim 2, characterized in that: In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding speed and the preset lubrication strategy, including: In the initial stage, the hardware parameters of the self-circulating clutch are obtained; wherein the hardware parameters include the cross-sectional area of ​​the friction plate groove; Determining an initial lubrication flow rate according to the sliding rotation speed and the cross-sectional area of ​​the friction plate groove; the initial lubrication flow rate is positively correlated with the sliding rotation speed and the cross-sectional area of ​​the friction plate groove; The lubrication flow of the self-circulating clutch is controlled according to the initial lubrication flow.

4. The lubrication flow control method of the self-circulating clutch according to claim 3, characterized in that: In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding speed and the preset lubrication strategy, including: During the process stage, determining whether the slip speed of the self-circulating clutch is greater than the first speed threshold; If the sliding speed is greater than or equal to the first speed threshold, a first dynamic lubrication flow is determined according to the sliding speed and the cross-sectional area of ​​the friction plate groove; and the lubrication flow of the self-circulating clutch is controlled according to the first dynamic lubrication flow; wherein the first dynamic lubrication flow is positively correlated with the sliding speed and the cross-sectional area of ​​the friction plate groove; If the sliding speed is less than the first speed threshold, the fixed lubrication flow corresponding to the sliding speed in the final stage is determined according to the preset correspondence between the sliding speed and the fixed lubrication flow, and the second dynamic lubrication flow is determined according to the difference between the initial lubrication flow and the fixed lubrication flow; the lubrication flow of the self-circulating clutch is controlled according to the second dynamic lubrication flow; wherein the second dynamic lubrication flow is positively correlated with the difference between the initial lubrication flow and the fixed lubrication flow.

5. The lubrication flow control method of the self-circulating clutch according to claim 4, characterized in that: In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding speed and the preset lubrication strategy, including: In the final stage, determining whether the slip speed of the self-circulating clutch is greater than the first speed threshold; If the sliding speed is greater than or equal to the first speed threshold, a first final lubrication flow is determined according to the sliding speed and the cross-sectional area of ​​the friction plate groove; and the lubrication flow of the self-circulating clutch is controlled according to the first final lubrication flow; wherein the first final lubrication flow is positively correlated with the sliding speed and the cross-sectional area of ​​the friction plate groove; If the sliding speed is less than the first speed threshold, the fixed lubrication flow is determined as a second final lubrication flow; and the lubrication flow of the self-circulating clutch is controlled according to the second final lubrication flow.

6. The lubrication flow control method of a self-circulating clutch according to any one of claims 1 to 5, characterized in that: In different control stages, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding speed and the preset lubrication strategy, including: In each control stage, obtaining the temperature of at least one key part of the self-circulating clutch; determining whether the self-circulating clutch has a maximum lubrication flow demand according to the temperature of the at least one key part; If the self-circulating clutch has a maximum lubrication flow demand, the lubrication flow of the self-circulating clutch is controlled according to a preset maximum lubrication flow; If the self-circulating clutch does not have a maximum lubrication flow demand, the lubrication flow of the self-circulating clutch is controlled according to the corresponding sliding rotation speed and a preset lubrication strategy.

7. The lubrication flow control method of the self-circulating clutch according to claim 6, characterized in that: The temperatures of the key parts include: inter-plate temperature, oil outlet temperature and oil pan temperature; The determining, based on the temperature of the at least one key part, whether the self-circulating clutch has a maximum lubrication flow demand comprises: If any one of the inter-plate temperature, the oil outlet temperature and the oil pan temperature is greater than the corresponding preset temperature threshold, it is determined that the self-circulating clutch has a maximum lubrication flow demand.

8. The lubrication flow control method of a self-circulating clutch according to any one of claims 1 to 5, characterized in that: The method further comprises: Obtaining the slip speed and requested torque of the self-circulating clutch; If the slipping speed is greater than a preset second speed threshold, and the requested torque is greater than a preset torque threshold, it is determined that the self-circulating clutch is in a slipping state; The second speed threshold is smaller than the first speed threshold.

9. A vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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